Support formating the automatic bundle manifest

[laeubi]

Currently the automatic manifest is used in its canonical compressed form what is hard to read.

There should be an option to format it just in case one want to examine it.

FYI As discussed at EclipseCon 2023 @merks @stbischof

@juergen-albert you mentioned a "bnd pretty print function" would be great to link to the class that could perform manifest formating at bnd.

[stbischof]

And add in an comment Feature that shortly describes segments of Manifest

[laeubi]

And add in an comment Feature that shortly describes segments of Manifest

The Manifest Specification does not mention any way to have a comment in a manifest file.

[stbischof]

https://github.com/bndtools/bnd/blob/master/aQute.libg/src/aQute/lib/manifest/ManifestUtil.java

https://github.com/bndtools/bnd/blob/44cd6d48beac442e7be22f0761231e010b555fa3/biz.aQute.bndlib/src/aQute/bnd/print/JarPrinter.java#L277C2-L277C2

https://github.com/bndtools/bnd/blob/master/biz.aQute.bndlib/src/aQute/bnd/print/JarPrinter.java

[laeubi]

ManifestUtil seem not support any specific formating (beside having ordered keys), JarPrinter seems to output a textfile describing the manifest but not a valid Manifest (its a bit hard to guess as there is no javadoc what is the full contract of MultiMap.format).