[IMP] website, *: lazy load most frontend javascript

* web, survey

This commit takes advantage of the other commits of this PR to enable
lazy loading for most frontend javascript:

1) Extract the minimum part of the assets common:
- promises library and polyfill
- boot.js

2) Create "assets_common_lazy" which is "assets_common" - "minimum"

3) Include the "minimum" assets in frontend layouts using "defer"
   loading and "assets_common_lazy" using "lazy" loading

4) Create a script to do the actual lazy loading in a "minimum" frontend
   assets

5) Lazy load the current frontend / website editor assets

Part of https://github.com/odoo/odoo/pull/32181
task-1961045