feat: add metrics to ingress-rpc

[wlawt]

Metrics added:

• RPC latency for:
  • eth_getAccount
  • eth_getLatestBlock
  • base_meterBundle
  • This is important as it tells us if it takes too long from ingress-rpc <> base-node-reth
• Validation durations for:
  • validate_tx
  • validate_bundle
• Total duration for send_raw_transaction and NOT send_bundle for now

Tested it by:

• Viewing it locally: localhost:9002

[danyalprout]

I think you're going to need to setup a prometheus metrics server for this in main.rs