Make VS Code autoformat QL files on save

[Marcono1234]

Specifies that VS Code autoformats QL files on save. This VS Code feature might not work correctly in some cases when used with auto-saving (see microsoft/vscode#45997 (comment)), but it hopefully works most of the time.

Autoformatting is quite useful because this repository enforces formatted QL files, and it is easy to forget manually formatting them.

⚠️ Autoformatting might be an intrusive change; additionally especially for larger files formatting might take some time.
Would it make sense to enable this for a 'trial' period and see what effects it has on regular development in this repository? E.g. whether it helps speeding up the work, or whether it hinder the work.

I am also not sure if for the queries of all programming languages in this repository formatting is enforced yet; if not, this pull request might cause undesired formatting changes.

[Marcono1234]

Note: When I typed this in VS Code it recommended "editor.wordBasedSuggestions": false, probably because the VS Code extension specifies that, see github/vscode-codeql#217. But it looks like this does not have to be specified here explicitly, it is apparently inherited from the extension settings.

[smowton]

Would a pre-commit hook be better?

[Marcono1234]

The Git documentation says:

It’s important to note that client-side hooks are not copied when you clone a repository.

Additionally it would require users to have the CodeQL CLI on their PATH, which might not be the case for everyone.
(Though on the other hand, not everyone might have installed the CodeQL VS Code extension either, but at least VS Code recommends usage of the extension.)