Adds ESLint workflow and stale issue management

[ChrisLauinger77]

Introduces ESLint for code linting and a stale workflow to manage inactive issues and pull requests.

• Adds an ESLint workflow to automatically scan code for potential issues.
• Configures a stale workflow to automatically mark and close inactive issues and pull requests, improving issue tracker maintainability.
• Removes jsconfig.json and global.d.ts

[github-advanced-security]

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[ChrisLauinger77]

This introduces the ESlint example from E.G.O. as well as workflow for stale issues.

I also deleted 3 unnecessary files.

@sakithb
also found a translation issue

Not really sure how to fix it elegantly - any idea ?

[ChrisLauinger77]

ESlint with E.G.O. rules found a lot of stuff. I can have a look end on the week.

[ChrisLauinger77]

@sakithb 110 code scanning issues found with the E.G.O. proposed settings.
https://github.com/sakithb/media-controls/security/code-scanning?query=pr%3A210+is%3Aopen

I tried to fix
Require the use of === and !==
which is the most found - but it is not as easy as replace "==" by "===" or "!=" by "!==" ...

[ChrisLauinger77]

I will not continue - I am frustrated :(

[sakithb]

@ChrisLauinger77 Would you like to take on maintaining the project fully?

[ChrisLauinger77]

I wanted some years ago. Now I don't.
Feels like running in circles. Moved also on to another extension. Not using media-controls any more

[sakithb]

I don't use GNOME any more, so I don't get to use / develop / test the extension easily anymore. I am hoping someone forks this or takes over maintenance. Anyway I will put up a banner in the README.