Semantic Highlight Improvement for Python

[rennsax]

As I've mentioned in #223 (comment), PR #223 seems to remove highlight of the conventional parameter self in Python.

Hello @SmitAkbari26 , I find this merge make `self` parameter lose its highlight when semantic tokens are enabled. Maybe more scopes should be considered.

Before:

After:

Python language server: Provided by the extension Pylance

I'm afraid that it's probably unreasonable. To compared with, we can see how the theme One Dark Pro handles this situation.

self is distinct from other variables, both in the color and style, therefore developers quickly distinguish them.

In fact, the problem is that cobalt2 theme doesn't support Python semantic highlight very much. I think this feature is necessary for Python devs including myself. Thanks for your consideration.

[SmitAkbari26]

Apologies for the delayed response, as I haven't been actively checking GitHub lately. I solve this self parameter lose its highlight when semantic tokens are enabled.

@Eitheages I hope i solve problem what you want.