Relayer balance metrics

[daniel-savu]

Done:

• scaffolding for fetching custom agent metrics
• abstractions for building a metrics fetcher for a given VM
• querying cosmos balances; e2e tested.
• querying evm balances; e2e tested.
  • Note that as a result, evm addresses are now no longer zero-padded when printed in the logs. This may break existing log queries
• fixed a nasty bug on ubuntu where wasmd (osmosisd dependency, part of the grpc query flow) would panic when a block is specified via x-cosmos-block-height. The fix was to bump the version of osmosisd from 19.0.0 to 20.5.0. Note that when running e2e on Mac OS, the osmosis version in use is still 19.0.0. That's because we need a fork that publishes a darwin target binary (currently pointing here)

For follow up PR:

• sealevel balance querying

I'm open to all renaming suggestions, I just tried to speed through and didn't ponder names too much

Relates to https://github.com/hyperlane-xyz/issues/issues/701
Closes https://github.com/hyperlane-xyz/issues/issues/702 (because the balance becomes available in the metrics endpoint for polling)

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[tkporter]

Looks good - some questions about how the abstractions are set up