Make IP/CIDR types conform to Codable (#454)

These types can benefit from swift's automatic
synthesis as the properties already conform to Codable. This will give
some flexibility for clients using these types to not have to add
extension and implement the encoding / decoding separately.

Author: yibozhuang

Sources/ContainerizationExtras/CIDRv4.swift

@@ -16,7 +16,7 @@
 
 /// Describes an IPv4 CIDR address block.
 @frozen
-public struct CIDRv4: CustomStringConvertible, Equatable, Sendable, Hashable {
+public struct CIDRv4: CustomStringConvertible, Equatable, Sendable, Hashable, Codable {
     /// The IP component of this CIDR address.
     public let address: IPv4Address
 

Sources/ContainerizationExtras/CIDRv6.swift

@@ -16,7 +16,7 @@
 
 /// Describes an IPv4 or IPv6 CIDR address block.
 @frozen
-public struct CIDRv6: CustomStringConvertible, Equatable, Sendable, Hashable {
+public struct CIDRv6: CustomStringConvertible, Equatable, Sendable, Hashable, Codable {
 
     /// The IP component of this CIDR address.
     public let address: IPv6Address

Sources/ContainerizationExtras/IPv4Address.swift

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 @frozen
-public struct IPv4Address: Sendable, Hashable, CustomStringConvertible, Equatable, Comparable {
+public struct IPv4Address: Sendable, Hashable, CustomStringConvertible, Equatable, Comparable, Codable {
     public let value: UInt32
 
     @inlinable

Sources/ContainerizationExtras/IPv6Address.swift

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Represents an IPv6 network address conforming to RFC 5952 and RFC 4291.
-public struct IPv6Address: Sendable, Hashable, CustomStringConvertible, Equatable, Comparable {
+public struct IPv6Address: Sendable, Hashable, CustomStringConvertible, Equatable, Comparable, Codable {
     @usableFromInline
     internal let value: UInt128
 

Sources/ContainerizationExtras/Prefix.swift

@@ -16,7 +16,7 @@
 
 /// CIDR prefix length (e.g., `/24` for a 24-bit network mask).
 @frozen
-public struct Prefix: Sendable, CustomStringConvertible, Hashable {
+public struct Prefix: Sendable, CustomStringConvertible, Hashable, Codable {
     public let length: UInt8
 
     /// Create a prefix (0-128). Use `ipv4(_:)` or `ipv6(_:)` for version-specific validation.