This release includes a lot of improvements to the stubs quality, courtesy of @arvidfm

Python command stubs

Positional arguments of commands now have default values of ...
query and/or edit flags are now included for commands detected as queryable and/or editable based on the description
- In query mode, any queryable argument takes a bool unless explicitly specified to only take a value in query mode as well, so these flags are now type hinted as X | bool
- The return type of queryable commands is now a union of the original return type as well as all queryable types
Commands whose synopsys defines multiple return types are expressed as type unions
Flags marked as multiuse are now type hinted as X | List[X]
Improved MEL to Python type conversion
The maya.cmds stub now includes various type aliases to make the function signatures a bit easier to read, e.g. Queryable[str] for str | bool and Range[float] for Tuple[float] | Tuple[float, float]

Python API stubs

Literals are now only printed to the stub files if they are simple literals that can actually be represented in Python, e.g. numbers, strings and empty lists/dicts, avoiding syntax errors from sequences like <property object at 0x7fc18a818400> in the stubs
The parser now keeps track of the fully qualified path of symbols imported from other modules, so e.g. MFnBase will be referenced as maya.OpenMaya.MFnBase when used in OpenMayaUI
The parser now attempt to guess the types of descriptor class members (property and getset_descriptor attributes) by instantiating the class and retrieving the member via the instance
The parser also tries to guess the type of parameters using the default value imported by inspect.signature
Members imported from other modules are no longer included
@staticmethod and @classmethod decorators are now detected and included in the stubs
Module-level global variables are now included in the stubs
Add special cases for init and cls so that the former always returns None, and the latter always has a cls argument

Stubs are now also generated for the top-level maya package in maya.__init__.pyi
__init__.pyi files are now included in all directories so that type checkers correctly detect them as Python packages
Any use of Callable is now type hinted as Callable[..., Any] to prevent type checkers for complaining about missing type parameters