feat(abg)!: provide untyped fields always and typed ones if type available

[Vampire]

Fixes#1585

I have to confess, that I did not check every change in the unit test workflow files,
so they should probably be looked again closely. But I think it should have done the right thing.
Or at least how I envisioned it.

no typing =>

• only _Untyped class with _Untyped properties
• nullability according to required status

full typing =>

• same _Untyped class as above
• but marked as @Deprecated with a replace hint for the typed class (works in the IDE),
• additionally a typed class with each property as typed and untyped version
• all properties nullable, with runtime checks that
  • not the typed and untyped is set both for one property
  • one of the two is set for required properties

partly typing =>

• same _Untyped and typed class as above
• for inputs that have no type declared only the _Untyped property is added
• the properties that are only untyped have the nullability according to required status, also in the typed class

[Vampire]

• feat(abg): clean up temporary files after jar creation #1617
• fix(abg): fix file handle leak in jar creation #1616
• perf(abg): create JARs only when they are actually requested #1615
• feat(abg): prefix the temporary directories #1614
• fix(abg): provide checksum for maven metadata #1613
• fix(abg): use the release date of the latest version for lastUpdated #1612
• feat: allow using version ranges to cope with stale Maven Local cache #1611
• fix(server): use correct coordinates in generated Maven metadata file #1610
• fix(server): use correct coordinates in generated POM file #1609
• fix(server): use correct coordinates and file names in generated GMM file #1608
• feat(server): make it possible to POST custom typings for testing during typing creation #1602
• fix(server): fix model version in generated POM #1601
• fix(abg): correct paths in source jar #1600
• fix(abg): do not use double slash for top-level action URL #1599
• feat(server): allow to refresh generated artifacts on demand #1598
• feat(abg)!: provide untyped fields always and typed ones if type available #1603 👈
• fix(abg): make pair building pretty again #1618
• main

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[krzema12]

Impressive, thanks! Just several minor things to discuss/fix.

[Vampire]

Additionally to the requested changes I also added a required tag to the KDoc for the cases where nullability does not reflect required status, i.e. in the typed class for typed properties.

[krzema12]

I approved, but it looks like CI didn't run. Any idea why?

Retriggered by creating a copy of this PR.