[IMP] web, *: reorganize our libraries' extensions

* web_editor, web_tour, website_event_track

Before this commit, one JS file was responsible for all the library
extensions and fixes. There were two main problems with this system:

- The file was only available in the backend (as some extensions are
  made on backend-only libraries).

- Some other modules were doing library customizations.

This commit creates one file per library to regroup their associated
customization and adds them in the right asset. These are placed in
the web module and every other module should avoid doing customizations.
This allows to have libraries consistency accross all modules and
between the backend and the frontend.

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