Add Serde Serialize and Deserialise to structs in zcash_history

[idky137]

This is required to open zebra's ReadStateService to remote use. The fist step in this process is implementing Serde Serialize andDeserialize for the ReadReasponse and ReadRequest structs in zebra-state, and therefore all primitives used.

The structs in zcash_history that need to implement serialisation are:

• zcash_history::entry::Version

• zcash_history::{EntryLink, EntryKind}

• zcash_history::node_data::{NodeDate, V2}

• zcash_history::tree::Tree

• zcash_history::version::{V1, V2}

• The Issue in Zebra tracking this task can be found here: feature: Remote ReadStateService. ZcashFoundation/zebra#9337.