refactor(monitor): avoid dependency on archive EVM nodes

[corver]

Currently, our internal RPC nodes must be partial archive nodes.
This is because we need to query historical (>128 blocks) state for monitoring purposes.
Operators should however be able to only run fullnodes, since they don’t need to query state at all. TODO: We should confirm this.

One option is to build a monitoring cache that queries and stores cursors per blockheight. We then query the cache for monitoring purposes (if actual query fails). We can then revert to using normal fullnodes.

• Move relayer startMonitoring to monitor service. Along with all required config and metrics. Update grafana to use new metrics.
• Implement emitcursorcache package in monitor binary
  • For each evm chain, stream xblocks, using ConfLatest.
  • For each xblock with ShouldAttest==true, fetch all emit cursors.
  • Store emit cursors locally on disk, index by height.
  • Trim the cache after 90k blocks.
• In monitorAttestedForever if GetEmittedCursor errors, fetch the emit cursor from the emitcursorcache using att.BlockHeight