feat: add --raw to version #1528

FWIW -- related, in the past I asked git-annex's Joey to provide some --version so it would list only the actual version without any other info, so it could be included as is in a uniform fashion among version and in 'standard' ready for comparison form (as to say if current version is greater or less than some other version), hence

❯ git-annex version --raw
10.20251029

and for some after release point

❯ git-annex version --raw
10.20260213+git57-gffa771e735-1~ndall+1

was born! ;)

(I personally just prefer more prevalent --version as option to the command)

And that is where then, to a degree, having hexsha embedded is good and bad

• good: allows for identification and exact comparison of the --version output alone
• bad: comparison might be misleading since e.g. two branches/rewrites might have the same number of commits off the tag but different hexshas

Originally posted by @yarikoptic in #1522 (comment)