chore!: Eliminate public Foundation.Date extension (#931)

Author: jbelkins

Sources/ClientRuntime/Networking/Http/Middlewares/DeserializeMiddleware.swift

@@ -7,6 +7,7 @@
 
 import SmithyHTTPAPI
 @_spi(SmithyReadWrite) import SmithyReadWrite
+import struct Foundation.Date
 import class Foundation.DateFormatter
 import struct Foundation.Locale
 import struct Foundation.TimeInterval

Sources/ClientRuntime/Networking/Http/URLSession/URLSessionHTTPClient.swift

@@ -18,6 +18,7 @@ import enum SmithyHTTPAPI.HTTPStatusCode
 import protocol Smithy.ReadableStream
 import enum Smithy.ByteStream
 import class SmithyStreams.BufferedStream
+import struct Foundation.Date
 import class Foundation.Bundle
 import class Foundation.InputStream
 import class Foundation.NSObject

Sources/ClientRuntime/Orchestrator/Orchestrator.swift

@@ -5,6 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+import struct Foundation.Date
 import class Smithy.Context
 import enum Smithy.ClientError
 import protocol Smithy.RequestMessage

Sources/ClientRuntime/PrimitiveTypeExtensions/Date+Extensions.swift

@@ -5,13 +5,14 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+import struct Foundation.Date
 import Smithy
 import SmithyIdentityAPI
 import ClientRuntime
 
 public struct MockIdentity: Identity {
     public init() {}
-    public var expiration: ClientRuntime.Date? = nil
+    public var expiration: Date? = nil
 }
 
 public struct MockIdentityResolver: IdentityResolver {