jooby-apt: turn off mvcMethod generator by default

[jknack]

No description provided.

[agentgt]

I would still like to do #3532 if possible for 4.0.0.

The question is if I do the PR should I wait for a 4.x branch or put it on the 3.x branch?

EDIT I see you already put it in!

[agentgt]

Also my complaints about the -A flag and Maven are not going to really be applicable in the future anyway as Maven improves on that.

Also future Java versions are really discouraging automatic annotation processor discovery so I will at some point have to list them anyway. For example in Java 21 you have to use -proc:full to have the annotation processors run anyway.

So I'm ok with it not generating it by default particularly in the future.