Improve PbjBytesHasher to reduce garbage

[jasperpotts]

Problem

PbjBytesHasher when hashing protobuf objects it is inefficient as it has to go form PBJ protobuf object to byte[] then to MessageDigest.

Solution

PBJ serialization is stream based and so is MessageDigest. We just need to connect them together. I have filled a PBJ enhancement to add convenience method to make this easy. Once that is implemented then PbjBytesHasher can be updated to use it.
See hashgraph/pbj#271
Also as a side note PbjBytesHasher is not the most obvious name as it is very generic, PbjEventHasher would be better 😀

Alternatives

No response

[lpetrovic05]

PbjBytesHasher is not currently being used, because it was replaced in develop by PbjStreamHasher that does not create a byte[] as an intermediary. So I think we can close this ticket

[lpetrovic05]

outdated, closing