gh-120321: Make gi_frame_state transitions atomic in FT build #142599
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This makes generator frame state transitions atomic in the free threading build, which avoids segfaults when trying to execute a generator from multiple threads concurrently. There are still a few operations that aren't thread-safe and may crash if performed concurrently on the same generator/coroutine: * Accessing gi_yieldfrom/cr_await/ag_await * Accessing gi_frame/cr_frame/ag_frame * Async generator operations
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This makes generator frame state transitions atomic in the free threading build, which avoids segfaults when trying to execute a generator from multiple threads concurrently.
There are still a few operations that aren't thread-safe and may crash if performed concurrently on the same generator/coroutine: