Added a margo-version.h header generated

[mdorier]

Adds a margo-version.h header generated from the version found in configure.ac. This is needed if we want libraries built on top of Margo to rely on different functions depending on their availability.

@carns Can you double-check that I haven't done anything stupid?

[codecov]

Codecov Report

Merging #252 (4096f4b) into main (3b8d8f8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   54.40%   54.40%           
=======================================
  Files          65       65           
  Lines        8865     8865           
  Branches     1164     1164           
=======================================
  Hits         4823     4823           
  Misses       3345     3345           
  Partials      697      697           

Impacted Files	Coverage Δ
include/margo.h	100.00% <ø> (ø)

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[carns]

I like having a version.h. I think it might be possible with an m4 macro to reuse one version number definition though, to make sure we don't accidentally get them out of sync. I'll tinker a little and report back.

[mdorier]

Yes, Argobots is a good place to look for this. I was thinking of doing it but got side-tracked looking into ways to get the version from git. Feel free to change this PR, I also don't really like that the version number is in two places (even though they are close by).

[mdorier]

@carns fine if I merge this? We can circle back to it and try to have m4 get the version number from a file later.

[carns]

Yeah this is fine, I opened #257 to track the later cleanup.

I actually got distracted looking at this because of the unit test failures due to one-way self rpc timing, no need to hold this up though.