Merge upstream changes for PEP695 support

[zanieb]

Includes the following upstream pull requests to add support for PEP 695 (type alias / generics) parsing:

• Add parsing of type alias statements i.e. the type keyword RustPython/Parser#97
• Parse type parameters in function definitions RustPython/Parser#96
• Parse type parameters in class definitions RustPython/Parser#95
• Update to the latest ASDL RustPython/Parser#93

Created by cherry-picking the upstreams' commits on top of our main branch e.g.

git log main..upstream/main --pretty=%h --reverse --no-merges | git cherry-pick --stdin

You can preview the commits with the --oneline flag e.g.

❯ git log main..upstream/main --reverse --no-merges --oneline --no-decorate
25b2399 Update Python ASDL for Python 3.12
df2b5df Regenerate code with latest ASDL
7b0aeee Add stub `type_params` handling for class and function definitions
30f461b Revert formatting changes to `python.rs`
3617a6c Bump size assertion for `Stmt` from 136 to 160 bytes
7516c42 Move `type_param` stubs into LALRPOP definition
d923aa9 Parse type parameters in class definitions
76a3245 Remove test for empty generic `class Foo[]: ...`
b06b266 Add test for tuple bounds
e0a8f5b Add bound to test case `test_parse_class_with_all_possible_generic_types`
3ec64e1 Consolidate tests and add coverage for trailing comma
6980037 Parse type parameters in function definitions (#96)
704eb40 Add parsing of type alias statements i.e. the `type` keyword (#97)

We should be able to preview commits that need cherry-pick in the future with an invocation like...

 git cherry main upstream/main -v