deprecate / remove enums

[d-v-b]

We use enums in a few places in the codebase, and I think in every instance a simple string literal is a better solution. We should remove or deprecate the use of Enum from the following modules:

• bytes.py:

  zarr-python/src/zarr/codecs/bytes.py

  Lines 21 to 27 in bce30dd

  	class Endian(Enum):
  	"""
  	Enum for endian type used by bytes codec.
  	"""
  	big = "big"
  	little = "little"

• indexing.py: https://github.com/zarr-developers/zarr-python/blob/bce30dd3cc92a35038b88f80c4c42130670d4100/src/zarr/core/indexing.py#L697C7-L720
• sharding.py:

  zarr-python/src/zarr/codecs/sharding.py

  Lines 68 to 74 in bce30dd

  	class ShardingCodecIndexLocation(Enum):
  	"""
  	Enum for index location used by the sharding codec.
  	"""
  	start = "start"
  	end = "end"

• blosc.py:

  zarr-python/src/zarr/codecs/blosc.py

  Lines 25 to 56 in bce30dd

  	class BloscShuffle(Enum):
  	"""
  	Enum for shuffle filter used by blosc.
  	"""
  	noshuffle = "noshuffle"
  	shuffle = "shuffle"
  	bitshuffle = "bitshuffle"
  	@classmethod
  	def from_int(cls, num: int) -> BloscShuffle:
  	blosc_shuffle_int_to_str = {
  	0: "noshuffle",
  	1: "shuffle",
  	2: "bitshuffle",
  	}
  	if num not in blosc_shuffle_int_to_str:
  	raise ValueError(f"Value must be between 0 and 2. Got {num}.")
  	return BloscShuffle[blosc_shuffle_int_to_str[num]]
  	class BloscCname(Enum):
  	"""
  	Enum for compression library used by blosc.
  	"""
  	lz4 = "lz4"
  	lz4hc = "lz4hc"
  	blosclz = "blosclz"
  	zstd = "zstd"
  	snappy = "snappy"
  	zlib = "zlib"