SourceControl: make some of the private API more public

This extends the visibility of some of the private implementation to the
package level to allow use for testing without `@testable` imports.

Author: compnerd

Sources/SourceControl/GitRepository.swift

@@ -1164,6 +1164,10 @@ extension GitFileSystemView: @unchecked Sendable {}
 package struct GitShellError: Error, CustomStringConvertible {
     let result: AsyncProcessResult
 
+    package init(result: AsyncProcessResult) {
+        self.result = result
+    }
+
     public var description: String {
         let stdout = (try? self.result.utf8Output()) ?? ""
         let stderr = (try? self.result.utf8stderrOutput()) ?? ""

Sources/SourceControl/RepositoryManager.swift

@@ -541,6 +541,11 @@ extension RepositoryManager {
         public let fromCache: Bool
         /// Indicates whether the repository was already present in the cache and updated or if a clean fetch was performed.
         public let updatedCache: Bool
+
+        package init(fromCache: Bool, updatedCache: Bool) {
+            self.fromCache = fromCache
+            self.updatedCache = updatedCache
+        }
     }
 }
 
@@ -609,7 +614,7 @@ extension RepositoryManager.RepositoryHandle: CustomStringConvertible {
 
 extension RepositorySpecifier {
     // relative path where the repository should be stored
-    internal func storagePath() throws -> Basics.RelativePath {
+    package func storagePath() throws -> Basics.RelativePath {
         return try RelativePath(validating: self.fileSystemIdentifier)
     }