add(rpc): Add a tonic server in zebra-rpc

[arya2]

Motivation

We want to implement the indexer RPC methods in a tonic server to stream responses to its clients.

Closes #8618.

Solution

• Adds a tonic server similar to the one in zebra-grpc
• Implements a simple chain_tip_change method which notifies clients when the best chain tip in Zebra changes

Tests

Tests that the server starts and the chain_tip_change method notifies the client when the best chain tip changes.

Follow-up Work

Implement the rest of the chain_tip_change method

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.