[Feature Request] ListWebhook - Add an ActionType to retrieve all hooks

[Janaka-Steph]

ACTION_TYPE_ALL_ACTIONS doesn't return all types. It only returns hooks set with action Any. It would be nice to be able to retrieve hooks of all possible types with a single request.

Also renaming ACTION_TYPE_ALL_ACTIONS to ACTION_TYPE_ANY_ACTIONS

[altafan]

I don't think it's necessary to add a new action type to retrieve all hooks, and it doesn't make really sense either IMO because we want to list all webhooks regardless their action.

Rather, we can either add a new RPC ListAllWebhooks or add a new boolean field all to the ListWebhookRequest message.

[altafan]

cc @tiero

[tiero]

add a new RPC ListAllWebhooks

this seems the way to go