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

检查 PEP-523、帧求值钩子，以及现有的 trace/profile 函数设置和清除路径；该 issue 没有指定具体文件或测试。当 C API 允许工具注册用于跟踪/性能分析启用状态变更的回调，而无需轮询，且行为与链接的 PR gh-144691 保持一致时，这项工作就完成了。