compiler: add option @generated=jakarta

[Hc747]

Add (optional) support for @jakarta.annotation.Generated while retaining existing functionality.

An extension of #11086 and continuation of #11215.

[ejona86]

It is not at all clear what problem this is trying to solve. In #12080 I'm disabling the third-party generated annotation. If we do need a new annotation, we'd want to own it, as with javax.annotations' removal from Java 9 there is not a general-purpose annotation to use for this purpose.

[Hc747]

There is and it's Jakarta.

[ejona86]

@Hc747, if you were trying to communicate something, it failed. I have no clue what you are talking about. I understand Jakarta is a thing and exists, but why is it relevant? If this is not done, what burden does it cause you?

[Hc747]

Jakarta annotations are 1:1 with javax annotations - it's literally just a different namespace due to legal reasons. Without the ability to support Jakarta we lose feature parity with javax and integration with tooling that identifies @Generated code via annotation.