chore(build): fix build warnings for swift 6 experimental features (#4041)

* chore(build): fix build warnings for swift 6 experimental features

* chore: add @unchecked Sendable conformances and nonisolated modifiers

* chore: fix swiftlint errors

* chore: add  @preconcurrency attribute for module imports

* chore: add more preconcurrency attributes

* chore: add preconcurrency to model generated files

* chore: fix failing unit test

* chore: revert ActivityTracker changes

* chore: update EndpointResolving

* chore: resolve swiftlint error

Author: thisisabhash

Amplify/Categories/API/Operation/RetryableGraphQLOperation.swift

@@ -72,7 +72,7 @@ public final class RetryableGraphQLOperation<Payload: Decodable> {
 
 }
 
-public final class RetryableGraphQLSubscriptionOperation<Payload: Decodable> {
+public final class RetryableGraphQLSubscriptionOperation<Payload> where Payload: Decodable, Payload: Sendable {
 
     public typealias Payload = Payload
     public typealias SubscriptionEvents = GraphQLSubscriptionEvent<Payload>

Amplify/Categories/API/Response/GraphQLError.swift

@@ -35,7 +35,7 @@ public struct GraphQLError: Decodable {
 extension GraphQLError {
 
     /// Both `line` and `column` are positive numbers describing the beginning of an associated syntax element
-    public struct Location: Decodable {
+    public struct Location: Decodable, @unchecked Sendable {
 
         /// The line describing the associated syntax element
         public let line: Int

Amplify/Categories/API/Response/GraphQLResponse.swift

@@ -15,7 +15,7 @@ public typealias GraphQLResponse<ResponseType: Decodable> =
     Result<ResponseType, GraphQLResponseError<ResponseType>>
 
 /// An error response from a GraphQL API
-public enum GraphQLResponseError<ResponseType: Decodable>: AmplifyError {
+public enum GraphQLResponseError<ResponseType>: AmplifyError where ResponseType: Sendable, ResponseType: Decodable {
 
     /// An error response. The associated value will be an array of GraphQLError objects that contain service-specific
     /// error messages. https://graphql.github.io/graphql-spec/June2018/#sec-Errors

Amplify/Categories/DataStore/DataStoreConflict.swift

@@ -6,7 +6,7 @@
 //
 
 /// Information about a conflict that occurred attempting to sync a local model with a remote model
-public struct DataStoreSyncConflict {
+public struct DataStoreSyncConflict: @unchecked Sendable {
     public let localModel: Model
     public let remoteModel: Model
     public let errors: [GraphQLError]?

Amplify/Categories/DataStore/Model/Internal/ModelListDecoder.swift

@@ -15,7 +15,7 @@ import Foundation
 /// application making any change to these `public` types should be backward compatible, otherwise it will be a breaking
 /// change.
 public struct ModelListDecoderRegistry {
-    public static var listDecoders = AtomicValue(initialValue: [ModelListDecoder.Type]())
+    nonisolated(unsafe) public static var listDecoders = AtomicValue(initialValue: [ModelListDecoder.Type]())
 
     /// Register a decoder during plugin configuration time, to allow runtime retrievals of list providers.
     public static func registerDecoder(_ listDecoder: ModelListDecoder.Type) {

Amplify/Categories/DataStore/Model/Internal/ModelProviderDecoder.swift

@@ -15,7 +15,7 @@ import Foundation
 /// application making any change to these `public` types should be backward compatible, otherwise it will be a breaking
 /// change.
 public struct ModelProviderRegistry {
-    static var decoders = AtomicValue(initialValue: [ModelProviderDecoder.Type]())
+    nonisolated(unsafe) static var decoders = AtomicValue(initialValue: [ModelProviderDecoder.Type]())
 
     /// Register a decoder during plugin configuration time, to allow runtime retrievals of model providers.
     public static func registerDecoder(_ decoder: ModelProviderDecoder.Type) {

Amplify/Categories/DataStore/Model/Internal/ModelRegistry.swift

@@ -16,11 +16,11 @@ public struct ModelRegistry {
     /// ModelDecoders are used to decode untyped model data, looking up by model name
     private typealias ModelDecoder = (String, JSONDecoder?) throws -> Model
 
-    private static var modelTypes = [ModelName: Model.Type]()
+    nonisolated(unsafe) private static var modelTypes = [ModelName: Model.Type]()
 
-    private static var modelDecoders = [ModelName: ModelDecoder]()
+    nonisolated(unsafe) private static var modelDecoders = [ModelName: ModelDecoder]()
 
-    private static var modelSchemaMapping = [ModelName: ModelSchema]()
+    nonisolated(unsafe) private static var modelSchemaMapping = [ModelName: ModelSchema]()
 
     public static var models: [Model.Type] {
         concurrencyQueue.sync {

Amplify/Categories/DataStore/Model/Internal/Schema/ModelField+Association.swift

@@ -86,7 +86,7 @@ import Foundation
 ///
 /// - Warning: Although this has `public` access, it is intended for internal & codegen use and should not be used
 ///   directly by host applications. The behavior of this may change without warning.
-public enum ModelAssociation {
+public enum ModelAssociation: @unchecked Sendable {
     case hasMany(associatedFieldName: String?, associatedFieldNames: [String] = [])
     case hasOne(associatedFieldName: String?, associatedFieldNames: [String] = [], targetNames: [String])
     case belongsTo(associatedFieldName: String?, targetNames: [String])

Amplify/Categories/DataStore/Model/Temporal/Date+Operation.swift

@@ -17,7 +17,7 @@ import Foundation
 ///
 ///     let yesterday = Temporal.Date.now() - .days(1)
 ///     let sixMonthsAgo = Temporal.Date.now() - .months(6)
-public struct DateUnit {
+public struct DateUnit: @unchecked Sendable {
     let calendarComponent: Calendar.Component
     let value: Int
 

Amplify/Categories/DataStore/Model/Temporal/Temporal+Cache.swift

@@ -12,7 +12,7 @@ extension Temporal {
     // of the formatter cache dictionary.
     //
     // DateFormatter itself is thread safe.
-    private static var formatterCache: [String: DateFormatter] = [:]
+    nonisolated(unsafe) private static var formatterCache: [String: DateFormatter] = [:]
 
     @usableFromInline
     /// The `Calendar` used for date operations.
@@ -26,7 +26,7 @@ extension Temporal {
     }()
 
     /// Pointer to lock to ensure exclusive access.
-    private static let lock: UnsafeMutablePointer<os_unfair_lock> = {
+    nonisolated(unsafe) private static let lock: UnsafeMutablePointer<os_unfair_lock> = {
         let pointer = UnsafeMutablePointer<os_unfair_lock>.allocate(capacity: 1)
         pointer.initialize(to: os_unfair_lock())
         return pointer