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

Revisa PEP-523, los hooks de evaluación de frames y las rutas existentes para establecer y borrar la función de tracing/profiling; el issue no especifica archivos ni tests concretos. El trabajo estará terminado cuando una C API permita a las herramientas registrar callbacks para los cambios en la activación de tracing/profiling sin tener que hacer polling, con un comportamiento alineado con el PR enlazado gh-144691.