Improve python-ts-mode fontification (bug#78129)

Improve python-ts-mode fontification (bug#78129)

Fontification based on selectors & code-conventions:

- Lambda parameters: variable declarations
- For in statements: variable declarations
- Import statements: variable declerations
- Constants: All upper case alphanumerical identifiers
- Types: CamelCase alphanumerical identifiers
- Enums: Enum-values as constants.

* lisp/progmodes/python.el:
(python--treesit-settings): Improve queries.

(cherry picked from commit 2964d51c9cd9b55e60901069c378d0e8277d60f9)