Deprecate and remove unstable heap representation details in GHC.Exts

The following GHC.Exts exports should be marked as deprecated, then removed in the following release:

data BCO#
mkApUpd0#      :: BCO# -> (# a #)
newBCO#        :: ByteArray# -> ByteArray# -> Array# a -> Int# -> ByteArray# -> State# s -> (# State# s, BCO# #)

CLC approval here: https://github.com/haskell/core-libraries-committee/issues/212

Edited Sep 11, 2024 by Rodrigo Mesquita

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