[make:stimulus-controller] Add classes support, generate usage code, fix doc, add tests

[smnandre]

Hello,

this PR adds new features to the Stimulus controller maker (and updates minor things)

• Add "default" methods (initialize, connect, disconnect) in generated code, with explanation of what they do and example of usage, to encourage good practices for event listeners
• Add cli option --typescript (shorcut: -ts) to choose extension from command line
• Add feature to generate classes attributes interactively
• Add code usage example at the end, to avoid (frequent) mistakes with data attribute placement or markup
• Cover new features with tests

Also

• Fix documentation links (StimulusBridge -> StimulusBundle)
• Set Javascript as default extension in interactive step
• Add missing tests for values

Most of things here are based on feedback received or mistakes seen frequently... but everything is of course very open to debate and suggestions 🤗

I tried to make a clean commit history to ease review, but if you do want, i can split this PR.

PS: I intentionally did not add outlets to this maker. They are a very advanced feature that can often lead to debatable choices in terms of component architecture, isolation, and more.