[5.9] Cherry pick "Add Sendable to Date, DateComponents, Data and UUID" (#4789)

* Add Sendable to Date, DateComponents and Data

* Make UUID Sendable

Author: FranzBusch

Darwin/Foundation-swiftoverlay/Date.swift

@@ -19,7 +19,7 @@ import CoreFoundation
 
  A `Date` is independent of a particular calendar or time zone. To represent a `Date` to a user, you must interpret it in the context of a `Calendar`.
 */
-public struct Date : ReferenceConvertible, Comparable, Equatable {
+public struct Date : ReferenceConvertible, Comparable, Equatable, Sendable {
     public typealias ReferenceType = NSDate
 
     fileprivate var _time : TimeInterval

Darwin/Foundation-swiftoverlay/DateComponents.swift

@@ -19,7 +19,7 @@
 
  When a new instance of `DateComponents` is created, the date components are set to `nil`.
 */
-public struct DateComponents : ReferenceConvertible, Hashable, Equatable, _MutableBoxing {
+public struct DateComponents : ReferenceConvertible, Hashable, Equatable, @unchecked Sendable, _MutableBoxing {
     public typealias ReferenceType = NSDateComponents
 
     internal var _handle: _MutableHandle<NSDateComponents>

Sources/Foundation/Data.swift

@@ -660,7 +660,7 @@ internal class __NSSwiftData : NSData {
 }
 
 @frozen
-public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessCollection, MutableCollection, RangeReplaceableCollection, MutableDataProtocol, ContiguousBytes {
+public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessCollection, MutableCollection, RangeReplaceableCollection, MutableDataProtocol, ContiguousBytes, @unchecked Sendable {
     public typealias ReferenceType = NSData
 
     public typealias ReadingOptions = NSData.ReadingOptions

Sources/Foundation/UUID.swift

@@ -16,7 +16,7 @@ public typealias uuid_t = (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt
 public typealias uuid_string_t = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
 
 /// Represents UUID strings, which can be used to uniquely identify types, interfaces, and other items.
-public struct UUID : ReferenceConvertible, Hashable, Equatable, CustomStringConvertible {
+public struct UUID : ReferenceConvertible, Hashable, Equatable, CustomStringConvertible, Sendable {
     public typealias ReferenceType = NSUUID
 
     public private(set) var uuid: uuid_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)