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Conform LossLessStringConvertible for UUID #1303

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jevonmao
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As discussed in Swift Forums and implemented in several frameworks like Vapor, UUID meets the semantic contract of LosslessStringConvertible. This PR adds conformance of UUID to LosslessStringConvertible.

Closes #1292

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We need an accompanying API proposal since this is changing the public interface. Do you have one?

@@ -16,7 +16,7 @@ public typealias uuid_string_t = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8

/// Represents UUID strings, which can be used to uniquely identify types, interfaces, and other items.
@available(macOS 10.8, iOS 6.0, tvOS 9.0, watchOS 2.0, *)
public struct UUID : Hashable, Equatable, CustomStringConvertible, Sendable {
public struct UUID : Hashable, Equatable, CustomStringConvertible, Sendable, LosslessStringConvertible {
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This new conformance and the new init need to have the new availability annotation.

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@itingliu I added the proposal. Could you abbreviated review for this?

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Conform UUID to LosslessStringConvertible
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