support .jpeg and .jpg image format

[vincentsarago]

right now we only support .jpg.

titiler/titiler/resources/enums.py

Lines 39 to 48 in 989d1b4

	class ImageType(str, Enum):
	"""Available Output image type."""
	png = "png"
	npy = "npy"
	tif = "tif"
	jpeg = "jpg"
	jp2 = "jp2"
	webp = "webp"
	pngraw = "pngraw"

FYI, this means we also need to modify https://github.com/cogeotiff/rio-tiler/blob/master/rio_tiler/profiles.py#L39-L49 to add jpg:JPEGProfile()