[IMP] web_editor: add loader for slow snippet options

Add a loader over the editor if an option takes some time to be applied
to indicate that something is being done.

In this commit, the following changes have been made:

- Add "_execWithLoadingEffect" method (will be used to add actions
to the mutex queue and set a loading screen over the editor 1s later).

- As soon as the mutex is unlocked (all computations are completed),
the loading effect will be removed (or canceled).

Part of https://github.com/odoo/odoo/pull/55614
task-2213114

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