Add C API to notify when tracing/profiling is enabled or disabled

Feature or enhancement

Proposal:

There is currently no way to be notified when tracing/profiling is enabled or disabled. This forces tools that want different behavior based on tracing/profiling enablement (e.g., JIT compilers) to poll on every function call, adding significant overhead.
PEP-523 established frame evaluation hooks as an officially supported extension point for JITs. However, JITs using this API have no efficient way to know when tracing/profiling is enabled and fall back to the interpreter.
I propose adding a small C API enhancement allowing callbacks to be registered when trace/profile functions are set or cleared.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-144691

PEP-523、フレーム評価フック、および既存の trace/profile 関数の設定・クリアのパスを確認してください。この issue では具体的なファイルやテストは指定されていません。ツールがポーリングなしで tracing/profiling の有効化の変更に対するコールバックを登録できる C API が提供され、動作がリンク先の PR gh-144691 に沿うようになれば、作業は完了です。