feat(relayer): bridge relayer messaging queue

[cyberhorsey]

Describe the feature request

Relayer should be split up into two subcommands, indexer and processor. Indexer indexes the chain and adds messages to a queue (rabbit, Kafka, etc). Processor reads from the queue.

This will enable high fault tolerance and persistence, especially when the chain is backed up and blocks take a very long time to verify.

A refactor should accompany this to use the same urfave cli package as taiko-client, to make it easier to work across both projects, and similiar subcommand/config pattern.

Describe alternatives you've considered

No response

Additional context

No response

[dantaik]

@cyberhorsey could you provide an ETA for this? I hope to launch alpha-5 ASAP.

[cyberhorsey]

@dantaik this is not something urgent, and can be deployed during alpha-5 if we choose to go down this path. Do not consider it a blocker.

The relayer is already up to date and working with the latest Bridge and Vault changes, including NFT support, which would block alpha-5.