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 42.06%. Comparing base (948e93e) to head (0ba70e7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3176      +/-   ##
==========================================
- Coverage   42.07%   42.06%   -0.01%     
==========================================
  Files         399      399              
  Lines       50722    50722              
==========================================
- Hits        21341    21337       -4     
- Misses      27371    27376       +5     
+ Partials     2010     2009       -1     

Flag	Coverage Δ
admin	11.55% <ø> (-0.05%)	⬇️
agent	51.98% <ø> (ø)
managed	42.78% <ø> (-0.01%)	⬇️
vmproxy	68.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[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!