refactor(narwhal-types): Clean narwhal type versioning

[bingyanglin]

Description of change

Clean up narwhal types

• Renamed Batch::V2 and BatchV2 to be Batch::V1 and BatchV1
• Renamed Certificate::V2 and CertificateV2 to be Certificate::V1 and CertificateV1

Note that the ConsensusCommit is indirectly used in ConsensusOutput, where current iota-core uses it. Might just keep them for now.

Links to any relevant issues

Fix #2096

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How the change has been tested

• I was running the local network with RUST_LOG=info cargo run --release --bin iota start --force-regenesis --with-faucet

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

The PR changed after the review, so it needs another round