Migrate to buf schema v2 and move api related tasks to dedicated Makefile

[artemgavrilov]

PMM-7

Link to the Feature Build: SUBMODULES-0

This PR migrates buf configuration to v2. It allowed to move all api related tasks to dedicated Makefile.

P.S. I was trying to find a way to use some plugins only for part of the modules, but unfortunately it's not possible for now.

https://buf.build/docs/migration-guides/migrate-v2-config-files

Same for PMM v3: #3178

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.34%. Comparing base (01b41df) to head (65a0497).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3176      +/-   ##
==========================================
+ Coverage   43.32%   43.34%   +0.02%     
==========================================
  Files         399      399              
  Lines       41654    41654              
==========================================
+ Hits        18046    18056      +10     
+ Misses      21590    21580      -10     
  Partials     2018     2018              

Flag	Coverage Δ
admin	11.61% <ø> (-0.06%)	⬇️
agent	52.88% <ø> (+0.13%)	⬆️
managed	44.39% <ø> (ø)
vmproxy	66.66% <ø> (ø)

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[ademidoff]

Great stuff, but I'm wondering if it is really worth to contribute such a change to v2 versus v3?

After we release 2.43.0, the whole team should completely switch their focus to getting v3 out the door.

[artemgavrilov]

Great stuff, but I'm wondering if it is really worth to contribute such a change to v2 versus v3?

After we release 2.43.0, the whole team should completely switch their focus to getting v3 out the door.

I can provide same changes for v3 as well, or just for v3.

[ademidoff]

Great stuff, but I'm wondering if it is really worth to contribute such a change to v2 versus v3?
After we release 2.43.0, the whole team should completely switch their focus to getting v3 out the door.

I can provide same changes for v3 as well, or just for v3.

OK, there is seemingly no harm for v2, so let's do both :)

Thanks for contributing, bro!