RFC: make participants aware of their conversation permissions

[Antreesy]

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Is your feature request related to a problem? Please describe.
It's known for moderators, but not for the participants itself, or could be found in some non-obvious places, although frontend is receiving and can use this data

Describe the solution you'd like
Conversation settings => Setup overview => List of permissions for given conversation

Describe alternatives you've considered
Context messages / tooltips where it's applicable

Example of usage (bitiwise + negation check):

videoButtonTooltip() {
	if (~this.conversation.permissions & PARTICIPANT.PERMISSIONS.PUBLISH_VIDEO) {
		return t('spreed', 'You are not allowed to enable video')
	}
},

[DorraJaouad]

Also disable the media streams toggle buttons if there is no corresponding permission?
It is not relevant to adjust your video camera/ mic when it will be turned off anyway.

[nickvergessen]

Also disable the media streams toggle buttons if there is no corresponding permission?
It is not relevant to adjust your video camera/ mic when it will be turned off anyway.

Well it could be that you are a speaker and will just receive the permissions later or after joining and identifying as such