add pub functionality for zaino

[idky137]

Motivation

For Zaino to use Zebra as its backed it requires access to primitives held in Zebra-Chain and Zebra-RPC.

• This PR will complete Task 1 of 1.3 Convert Indexer service to use zebra’s primitives. zingolabs/zaino#50

Solution

-Several structs in zebra-rpc were made pub and getter / setter functionality was added.
-From impl was added to ['ConsensusBranchId'] in zebra-chain.

Tests

The most complex functionality added is simple getter / setter impls, I believe that adding new tests for this would be inefficient / redundant.

Follow-up Work

Due to patched libraries in Zebra:main causing issues in Zaino these changes were made atop v1.9.0, once the patches are removed we will update the zebra version to 2.0.0, there is a chance that additional changes will be required for changes in zebra v2.0.0.

PR Author's Checklist

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.