Typed captions support

[GuiLeme]

What does this PR do?

This PR does essentially 3 things:

• Adds new type of UI-extensible area: sidekick-content, which is a generic-component;
• UI command to minimize the sidebar panel;
• Creates new Server-command to send caption via user.

Other than that, there are a few bugs found in the data-channel flow such as the remove entry function not working, those are already fixed by now.

Motivation

As mentioned in the title of this PR it is made to support the new typed-captions plugin.

More

Closely related to https://github.com/bigbluebutton/bigbluebutton/pull/20292

[github-actions[bot]]

This pull request has conflicts ☹ Please resolve those so we can review the pull request. Thanks.

[GuiLeme]

Closing this PR in favor of https://github.com/bigbluebutton/bigbluebutton-html-plugin-sdk/pull/92