Improve developer experience + workflow

[scheidtdav]

I went over a bunch of workflow and developer experience topics and collected them in this PR:

1. ESLint wasn't really set up properly (at least not for me), so I have added necessary packages and configuration files
2. I have added a .vscode/settings.json for common configurations (like setting prettier as the default formatter, so stuff is actually formatted according to the set rules automatically)
3. A launch configuration allows to debug TypeScript, which I have added as well
4. Lastly I have setup a DevContainer. This allows to isolate dependencies into a container which you can easily remote into from inside VSCode. No need to mess with node versions whatsoever and everbody has the same environment, setting an end to "works on my machine!" :-D

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​typescript-eslint/​parser@​8.29.1
	@​typescript-eslint/​eslint-plugin@​8.29.1
	eslint-plugin-prettier@​5.2.6

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