languages: Improve semantic token highlighting for parameters and Python (#52130)

## Context

Zed's semantic token highlighting does not cover all token types
returned by language servers, so the highlighting looks fairly primitive
compared with tree-sitter highlighting, especially for Python language
servers. This PR adds some global and Python-specific rules for better
highlighting.

I need to admit that the built-in Python language servers currently have
weak semantic highlighting implementations. Pylance, the closed-source
Python language server from Microsoft, provides the best highlighting
for now, but I think ty will do better, even though it still has a long
way to go.
## How to Review

Basically, this is a rule-adding change. Some rules are made global, and
some are made Python-specific.

## Self-Review Checklist

<!-- Check before requesting review: -->
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- Improved semantic token highlighting for parameters and Python

crates/languages/src/python/semantic_token_rules.json

@@ -0,0 +1,15 @@
+[
+  {
+    "token_type": "selfParameter",
+    "style": ["variable.special"]
+  },
+  {
+    "token_type": "clsParameter",
+    "style": ["variable.special"]
+  },
+  // ty specific
+  {
+    "token_type": "builtinConstant",
+    "style": ["constant.builtin"]
+  }
+]