CLI: Don't `exit()`, accept `--yes` and array inputs for batch operations

[traumschule]

Context: #1571, #1591

Scope

• The CLI uses exit() and cannot be called from node to manage multiple tx after another or in parallel because the child process exits the parent.
• Many commands require using yes | joystream-cli to force the cli to work. Add --yes as option to all commands that lack it.
• Managing content often requires calling the same function hundreds of times. Offer to submit parameters as array whenever possible / it makes sense based on context. For example accept assetId / videoId pairs for content:deleteChannelAssetsAsModerator, or even accept a list of assetId and fetch the according video internally.