Improve typing of Matrix Quaternion and Vector @ operation

[JonathanPlasse]

Matrix, Quaternion, and Vector @ operation is incompatible with Sequence[float]. Only __matmul__ is needed __rmatmul__ and __imatmul__ can be removed.

The following code is all the valid @ operations.

from mathutils import Matrix, Quaternion, Vector

v = Vector((1, 2, 3))
m = Matrix(((1, 2, 3), (4, 5, 6), (7, 8, 9)))
q = Quaternion((1, 2, 3, 4))

f1: float = v @ v
v1: Vector = m @ v
v2: Vector = v @ m
m1: Matrix = m @ m
q1: Quaternion = q @ q
q2: Vector = q @ v

m @= m
q @= q

The code above pass Mypy and Pyright with the changes below.

class Matrix:
    @typing.overload
    def __matmul__(self, other: "Matrix") -> "Matrix":
        ...

    @typing.overload
    def __matmul__(self, other: "Vector") -> "Vector":
        ...

    def __matmul__(
        self, other: typing.Union["Matrix", "Vector"]
    ) -> typing.Union["Matrix", "Vector"]:
        ...


class Quaternion:
    @typing.overload
    def __matmul__(self, other: "Quaternion") -> "Quaternion":
        ...

    @typing.overload
    def __matmul__(self, other: "Vector") -> "Vector":
        ...

    def __matmul__(
        self, other: typing.Union["Vector", "Quaternion"]
    ) -> typing.Union["Vector", "Quaternion"]:
        ...


class Vector:
    @typing.overload
    def __matmul__(self, other: "Vector") -> float:
        ...

    @typing.overload
    def __matmul__(self, other: "Matrix") -> "Vector":
        ...

    def __matmul__(self, other: typing.Union["Vector", "Matrix"]) -> typing.Union["Vector", float]:
        ...