Add embed parameters to peertube-video-embed custom client markup

[MillironX]

Describe the problem to be solved

Right now, all videos embedded on a page using the <peertube-video-embed> tag have hard-coded dimensions, which cuts videos off on mobile, and add excess empty space on desktop.

In addition, the IP privacy warning sends a weird message to those visiting my site who are less familiar with PeerTube.

While there are options to make the embed responsive and remove the privacy warning for creating embeds with each video's UI in other locations, these options are not available to embeds within the site using <peertube-video-embed>, and <iframe> tags are not allowed in the custom markup, so using the embeds generated using the video UI is not an option.

Describe the solution you would like

I would like to add data-* tags for the <peertube-video-embed> that allow for use of most of the embed options available in the embed UI. Particularly, I am interested in adding

data- attribute	Corresponding UI option
data-responsive	"Responsive embed" checkbox
data-privacy-warning	"Display privacy warning" checkbox

But I propose the following tag names for any of the other options available if others are interested:

data- attribute	Documentation
data-start-at	Timecode to begin playback of the embed at in the format #h#m#s
data-subtitle	Language code of subtitles to have enabled in the embed
data-responsive	Make the embed responsive at all screen sizes or not
data-stop-at	Timecode to end playback of the embed at in the format #h#m#s
data-autoplay	Start playback of the embedded video on page load
data-muted	Mute audio of the embedded video
data-loop	Loop playback of the embedded video
data-display-title	Show title over the embedded video
data-p2p	Use peers if available to play video
data-privacy-warning	Display IP privacy warning
data-player-control	Display player bar in embed
data-peertube-link	Show button linking back to host instance

[Chocobozzz]

Nice idea! PR welcome :)