Add bulk upgrade CLI

[adizere]

Crate

ibc-relayer-cli

Summary

The upgrade CLI (introduced in informalsystems/ibc-rs#723) expects as argument the identifier of a specific client which to upgrade. It would be beneficial to permit upgrading all IBC clients hosted on the same chain and targeting the same chain (instead of forcing upgrades to work on a discrete client-by-client basis).

Proposal

For instance,

hermes tx raw upgrade-client DST-CHAIN SRC-CHAIN

will upgrade all clients hosted on DST-CHAIN that verify headers for the upgraded SRC-CHAIN.

Tasks:

• modify the upgrade CLI to have optional client identifier parameter; if this parameter is missing, then perform bulk upgrade of all found clients
• update ADR 006 to include the upgrade client command, which would be similar to the create client and update client commands (see ADR 006#clients)
• consider retiring the tx raw upgrade-client command in favor of upgrade client

Original comment from PR review

I think we should make dst_client_id optional and if not entered to upgrade all clients of src_chain_id present on dst_chain_id. The way it is, with a lot of clients, the user needs to query all clients and issue the upgrade for each client.
Also, we should have a hermes client upgrade.. command in place of or in addition to this command.

Originally posted by @ancazamfir in informalsystems/ibc-rs#723 (comment)

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