Add `GODOT_PROFILING_FUNCTION` support in GDExtension (similar to GDNative in 3.x)

[Withaust]

Previously in GDNative there was a handy GODOT_PROFILING_FUNCTION macro, which allowed to profile custom C++ methods/functions in the main editor profile, but now in GDExtention there does not seem to be a way to achieve the similar result.

[dalygbarron]

I see that this is closed as completed, but it is not linked with any code changes to look at and also GODOT_PROFILING_FUNCTION has not been added back to the codebase. If it's ok could I ask how this is going to work from now on if that macro is not being used?

[Calinou]

@Withaust Did you find a solution to this problem? If so, please document it here by commenting 🙂

For context, I reopened the issue because it didn't seem like it was actually resolved.

[dalygbarron]

yeah I started looking last night to see if I could sort it out myself and I am pretty sure the functionality no longer exists since it was relying on a call to some kind of gdnative api. If somebody were to point out how similar functionality could be acheived in the current codebase I'd be happy to make a PR, but as it stands I do not know how.

[Withaust]

I don't remember why I closed this, but this functionality is still missing.