Commits on Aug 28, 2023

1. PEP 695 - Type Parameter Syntax …

   This PR adds support for parsing and representing Type Parameters and Type Aliases as specified by PEP 695. What's missing are the scope rules, to be implemented in a future PR.
   
   Notable (user visible) changes:
   
   - new `TypeAlias` CST node, which is a `SmallStatement`
   - new CST nodes to represent TypeVarLikes: `TypeVar`, `TypeVarTuple`, `ParamSpec`
   - new helper CST nodes:  `TypeParameters` to serve as a container for multiple TypeVarLikes, and `TypeParam` which is a single item in a `TypeParameters` (owning the separating comma)
   - extended `FunctionDef` and `ClassDef` with an optional `type_parameters` field, as well as `whitespace_after_type_parameters` to own the extra whitespace between type parameters and the following token
     - these new fields are added after all others to avoid breaking callers passing in fields as positional arguments
   - in `FunctionDef` and `ClassDef`, `whitespace_after_name` now owns the whitespace before the type parameters if they exist

   

   zsol committed Aug 28, 2023
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