feature: have the command to keep the client updated

## Overivew
Make sure the clients are updating the tendermint client.
Run the following commands somehow:

```
hermes-update:
kubectl exec -i hermes-agoric-osmosis-0 -c relayer -- hermes update client --host-chain agoriclocal --client 07-tendermint-0
kubectl exec -i hermes-agoric-gaia-0 -c relayer -- hermes update client --host-chain agoriclocal --client 07-tendermint-1
sleep 60
make hermes-update
```

## Proposal
Make it part of the exposer to be running next to the sidecar