Cardano Updates

Upon decoding of a type it is quite possible to have a much larger
lazy `ByteString` that is being supplied to the decoder, eg. decodign Tx
in a Block.

In order to ensure that that lazy buffer is not retained in memory we
need to make a full copy of the slice, but only during decoding, not
during construction, cause otherwise every lens update would incur
significant overhead due to redundant serialization

`BinaryData` never requests the memoized Hash, so there is no need to
retain the `ByteString`, it is better to use the already available
`ShortByteString`

...by using pack from MemPack.

This is expected to reduce memory fragmentation since ByteArray does not
use pinned memory.

Remove `sbsToByteArray` and `byteArrayToSbs` from `Mary.Value` in favor
of using `Data.MemPack.Buffer.byteArray{to|from}ShortByteString

Use `sizeofByteArray` from the primitive package in place of length for
this field.

Also, add an orphan `IsString` instance for `ByteArray`, and define
`NoThunks` for `PoolMetadata`.