feat(sequencer): allow querying fee components

[SuperFluffy]

Summary

Returns a all fee components at the latest height when sending an ABCI info request containing the path "fees/components".

Background

Right now information on the sequencer state is very limited. This patch allows getting a bit more info out of it.

Changes

• Adds a handler for the path "fees/components" into the ABCI info service running inside sequencer.
• The handler returns a JSON object containing the values for each component. Each component can return one of the 3 states shown below:

{
    "transaction": {
        base: 1,
        multiplier: 2,
    },
    "rollup_data_submission": "not set",
    "ibc_relay": "<some error message",
}

Testing

Provided an error for sending a high level ABCI info request to the Info service.