Allow custom js at runtime

[skamensky]

see

https://github.com/orgs/cortezaproject/discussions/808

A lot of ideas and discussions are around the UI and potential improvements to it.

I think it could be a good idea to allow users to add an "include" to a js source file (or a raw source string) as an escape hatch for advanced users.

For example, if I want to add a hotkey so when users press ctrl+s it saves the page, I don't have to wait for corteza to add it (if they decide to add it), and I also don't need to clone the whole front-end and take it on as a maintenance burden for that small change.

The approach suggested in #1224 where there's a "FE Textarea in Admin/UI" seems like a nice and basic way to start.

[github-actions]

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