Changed name of first _Tile parameter

[radarhere]

Pillow/src/PIL/ImageFile.py

Lines 93 to 97 in e478775

	class _Tile(NamedTuple):
	encoder_name: str
	extents: tuple[int, int, int, int]
	offset: int
	args: tuple[Any, ...] | str | None

Because tiles can be used to indicate either how an image is to be encoded or decoded, I suggest codec_name instead of encoder_name.