std.Thread: ResetEvent improvements

[kprotty]

Main Goals

• Removes StaticResetEvent and makes ResetEvent statically initializable.
• Removes AutoResetEvent and replaces all uses of it with ResetEvent.

Side Goals

• Introduce builtin.sanitize_thread to detect when being compiled with TSan (LLVM Thread Sanitizer)
• Introduce Atomic.fence which differs from atomic.fence as it takes an atomic variable and cooperates with tsan since tsan generates false positives with normal fences.

Closes

• std.ResetEvent - flaky test disabled on some OS's #7009 because the ResetEvent tests no longer relies on timing
• Thread: replaced SpinFutex with Thread.Futex for macOS in StaticResetEvent #10580 because it removes StaticResetEvent (which used to spin on sched_yield()) for ResetEvent which waits with darwin's ulock futex.
• llvm assertion failed: Failed to convert memory constraint code to constraint id in std.atomic.Atomic bitRmw() #9163 because why not