Add a metrics endpoint

[anoma]

Add a metrics endpoint

[tzemanovic]

We're going to be using Prometheum in https://github.com/heliaxdev/anoma-network-init/issues/6.

For Anoma's stuff that's not part of Tendemint (rockDB, wasm caches, etc.), we can possibly also use Prometheum, maybe via https://crates.io/crates/prometheus

[tzemanovic]

@Fraccaman is there anything left for this (other than updates with ABCI++)?

[Fraccaman]

We are currently just using the tendermint prometheus endpoint, we could integrate some more specific anoma/namada metrics.

[cwgoes]

@Fraccaman what is the status of this / do you think there is important work remaining to be done before Namada mainnet?

[Fraccaman]

I think we can leave this for sometime in the future, we already have the tendermint prometheus endpoint.