* feat: add `--connection-hops` parameter to tx chan-open-init

* Create directory `relayer-types/core/ics33_multihop` for ics33
  definitions

* Define structs `ConnectionHop` and `ConnectionHops`

* Add `connection_hops` field to struct `Channel`

* patch ibc-proto-rs for multihop support

* Add connection hops support to `build_chan_open_init_and_send`

* Enable parsing of multihop `channel_open_init` events

* Add a wrapper struct `ConnectionIds` for Vec<ConnectionId>

* Change `connection_id` type from `ConnectionId` to `ConnectionIds` in
  structs `Attributes`, `OpenInit`, `OpenTry`, `OpenAck`, `OpenConfirm`,
  `CloseInit` and `CloseConfirm`

* Fix clippy warnings

* Apply review suggestions and fix clippy warnings

* Add review suggestions and fix clippy warnings

* Apply suggestions from code review

Co-authored-by: Romain Ruetschi <romain@informal.systems>
Signed-off-by: Joāo Chervinski <22059902+joaotav@users.noreply.github.com>

* Change `--connection-hops` type from `Option<Vec<ConnectionId>>` to
`Option<ConnectionIds>`

* Update guide templates

* Fix failing CI tests

* Add tests for tx chan-open-init CLI

* Apply review suggestions

* Add and update FIXMEs

* Replace "/" with "\" for proper line concatenation

* Update guide templates

---------

Signed-off-by: Joāo Chervinski <22059902+joaotav@users.noreply.github.com>
Co-authored-by: Romain Ruetschi <romain@informal.systems>