Type checking fixes

[Kovid Goyal]

Hi Phil,

I would appreciate it if a few minor type check fies could be made in
PyQt. Detailed below:

QBytearray should have the method

    def __buffer__(self, flags: int, /) -> memoryview: ...


pyqtBoundSignal's connect method is missing the type parameter.

There is no pyqtProperty, this is a basic one I came up with


```
_T = TypeVar('_T')
_R = TypeVar('_R')

class pyqtProperty:
    # --- Overload 1: Used as a decorator factory (e.g., @pyqtProperty(int)) ---
    @overload
    def __init__(
        self,
        type: type[_R] | str,
        fget: None = None,
        fset: None = None,
        freset: None = None,
        fdel: None = None,
        doc: str | None = None,
        designable: bool = True,
        scriptable: bool = True,
        stored: bool = True,
        user: bool = False,
        constant: bool = False,
        final: bool = False,
        notify: pyqtSignal | None = None,
        revision: int = 0,
    ) -> None: ...

    # --- Overload 2: Used as a functional constructor (e.g., x = pyqtProperty(int, get_x, set_x)) ---
    @overload
    def __init__(
        self,
        type: type[_R] | str,
        fget: Callable[[Any], _R],
        fset: Callable[[Any, _R], None] | None = None,
        freset: Callable[[Any], None] | None = None,
        fdel: Callable[[Any], None] | None = None,
        doc: str | None = None,
        designable: bool = True,
        scriptable: bool = True,
        stored: bool = True,
        user: bool = False,
        constant: bool = False,
        final: bool = False,
        notify: pyqtSignal | None = None,
        revision: int = 0,
    ) -> None: ...

    # --- Behaviors required to act like a standard Python property descriptor ---
    def __call__(self, fget: Callable[[_T], _R]) -> pyqtProperty: ...
    def __get__(self, instance: _T, owner: type[_T] | None = None) -> _R: ...
    def __set__(self, instance: _T, value: _R) -> None: ...
    def __delete__(self, instance: _T) -> None: ...

    def setter(self, fset: Callable[[_T, _R], None]) -> pyqtProperty: ...
    def deleter(self, fdel: Callable[[_T], None]) -> pyqtProperty: ...
```

Thanks.

--
_____________________________________

Dr. Kovid Goyal
https://www.kovidgoyal.net
https://calibre-ebook.com
_____________________________________