feat(html5): Added sendGenericDataForLearningAnalyticsDashboard for plugins

[GuiLeme]

What does this PR do?

Basically adds the possibility for the plugin to add a learning analytics dashboard data. Here it follows a demo:

https://github.com/bigbluebutton/bigbluebutton/assets/69865537/a436f340-8adc-4095-b1d3-2ccc5b8f58e6

One interesting thing to mention is the structure of the learning_dashboard.json: so a json entry will be added to the users' directives just like:

{
...
"users":{ 
  ....
  "w_arc2a7bo7lv0-1":{
    ...
    "plugins":[{"pluginName":"H5pPlugin","genericDataForLearningAnalyticsDashboard":{"columnTitle":"Programming exam","value":"2"}}],
...
}

More

Closely related to https://github.com/bigbluebutton/bigbluebutton/pull/20628