Allow plugin to add shortcode like peertube components in markdown

[Nalem14]

Describe the problem to be solved

It can be cool to can add shortcode like peertube components we can already add in markdown editor
So users can customize a custom page or homepage with these shortcodes added by some plugins

Describe the solution you would like

Using a method like registerSettings, we can do registerComponent or registerShortcode, and attach a handler with all params passed as an object ( data = {} )

Example using <my-custom-component name="john"> or [my-custom-component name="john"]

Example declaration :

registerComponent({
    name: "my-custom-component",
    handler: (params) => {
        return '<p>Hey ${params?.name}</p>';
    }
});