feat: Add symbol listing for Qml

[itzurabhi]

symbol listing for Qml added.

[narnaud]

This is on the right track. I didn't test it (I wonder if you see the symbols in the GUI yet), but the architecture definitely makes sense.

[LeonMatthesKDAB]

Overall looks like a reasonable way forward 👍

One additional thing to consider though is that the FunctionSymbol class also runs a few small queries to figure out the names and types of parameters (see the argumentsFromQueryMatch function).

However, that is of course also C++-specific and won't work with QML.
We should try to find a solution for injecting the right behavior there as well.

Also added some minor nitpicks.

[itzurabhi]

This is on the right track. I didn't test it (I wonder if you see the symbols in the GUI yet), but the architecture definitely makes sense.

yes we can

[LeonMatthesKDAB]

The separation of concerns looks clean 👍

What I'd like to see addressed before merging:

1. Find a way to make FunctionSymbol::arguments compatible with Qml.
   • Currently it's not capturing the individual parameters as @parameter, so the FunctionSymbol will always report 0 arguments
   • The types of the arguments would be extracted incorrectly in the FunctionSymbol::argumentsFromQueryMatch function, which would have to also differentiate between languages.
2. Add tests for all types of QML symbol extraction. Currently this is entirely untested.

I guess we could also do these in follow-up PRs, but I don't expect much conflict in this part of the codebase at the moment, so it would be preferable to have everything in before merging.

[LeonMatthesKDAB]

Hm, I also took another look at the ClassSymbol. I guess that also won't work correctly, as it will probably associate all members from all sub-objects into itself.
It currently doesn't check whether there's another classsymbol that encompasses sub-members 🤔

[LeonMatthesKDAB]

Going in the right direction, but the testing should be more thorough.

[LeonMatthesKDAB]

Looks good. We'll want to follow up on this with fixes for FunctionSymbol and ClassSymbol, but a very good start 🥳