[Tracking] Expose a `Lock` type

[kouvel]

• [x] Proposal for the Lock API - https://github.com/dotnet/runtime/issues/34812
  • Partially approved, may need further discussion/changes based on other items
• [x] Expose a Lock type in preview mode - PR: https://github.com/dotnet/runtime/pull/87672
• [ ] Diagnostics - PRs: https://github.com/dotnet/runtime/pull/101192, https://github.com/dotnet/runtime/pull/101501
• [x] Proposal for integrating with the C# lock keyword - https://github.com/dotnet/csharplang/issues/7104
• [ ] Basic performance tests
• [x] Make the Lock type non-preview - PR: https://github.com/dotnet/runtime/pull/102222
• [x] Document the Lock API surface - PR: https://github.com/dotnet/dotnet-api-docs/pull/9912
• [ ] Document the new config vars

[ghost]

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Issue Details

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- [ ] [Pending] Expose a `Lock` type in preview mode - https://github.com/dotnet/runtime/pull/87672 - [ ] SOS diagnostics - [ ] Other diagnostics for determining a lock owner - [ ] Proposal for integrating with the C# `lock` keyword - https://github.com/dotnet/csharplang/issues/7104 - Discussed approach, further discussion pending - [ ] Proposal for the `Lock` API - https://github.com/dotnet/runtime/issues/34812 - Partially approved, may need further discussion/changes based on other items - [ ] Roslyn analyzer warning for when an `await` is used or an async method is called inside a `using (_lock.EnterScope())` block - [ ] Roslyn analyzer warning for when `Lock` object is implicitly casted to a type (including a generic type `T`) that does not match the pattern for the integration with the C# `lock` keyword

Author:	kouvel
Assignees:	-
Labels:	`area-System.Threading`
Milestone:	Future

[mangod9]

Closing since new Lock Type is now enabled in 9.