[admin-tool] Venice-specific path filtering logic for ZooKeeper Snapshot and Restore tooling

[bonytoni]

Venice-specific path filtering logic for ZooKeeper Snapshot and Restore tooling

Overview: To remove ZooKeeper as a potential Single Point of Failure (SPoF) during an outage, we are cloning Venice-specific ZooKeeper paths in the parent region and restoring it in another region's local Zookeeper to continue serving as the primary parent controller and resuming Nuage, VPJ, and Samza operations offline where it left off.

This PR:

• Implemented AdminTool command that extracts Venice-specific paths from a ZK snapshot input text file to an output text file
• Implemented path filtering logic in ZkCopier.java
• Refactored multiple files with Venice-managed ZK path constants from VeniceZkPaths.java

Next steps: AdminTool command that clones Venice-specific paths from a source ZK (local or live instance) to a destination ZK (local or live instance)

How was this PR tested?

Unit Testing, Manual Testing

Does this PR introduce any user-facing changes?

• No. You can skip the rest of this section.
• Yes. Make sure to explain your proposed changes and call out the behavior change.

[nisargthakkar]

My review is still in progress and I still need to go through the main filtering algorithm. But I wanted to leave a partial review so you can start addressing the preliminary comments

[nisargthakkar]

Mostly looks good. Good job

[nisargthakkar]

LGTM. Thanks @bonytoni