Provide automatic buildinfo for plugins

[marckhouzam]

What this PR does / why we need it

This is kind of a follow-up of the refactoring of #3201.
The PR simply copies pkg/v1/buildinfo/buildvar.go to a new cli/runtime/buildinfo package.
This will allow plugins to get access to buildinfo.Version, buildinfo.SHA and buildinfo.Date without having to import Framework.

The PR also updates the Makefile.tmpl template to inject those values and the main.go.tmpl to use this mechanism for new plugins.

Which issue(s) this PR fixes

Fixes #3230

Describe testing done for PR

Created a new plugin and built it and verified that Version and SHA were injected automatically:

tanzu builder init myplugin --repo-type github
cd myplugin
tanzu builder cli add-plugin myplugin --description myplugin
git add .
git commit -m start
make init || true

# point the go.mod to my local Framework repo
echo "replace github.com/vmware-tanzu/tanzu-framework/cli/runtime => /Users/$USER/git/tanzu-framework/cli/runtime" >> go.mod
go mod tidy -compat=1.17
make build-local

# Call the built binary which depends on your machine arch and os
artifacts/darwin/arm64/cli/myplugin/v0.0.1/tanzu-myplugin-darwin_arm64 info

# Check that the Version and SHA are set properly

Release note

Additional information

We would need some doc to teach this to plugin developers. I can add it once #3259 is merged.

[rajathagasthya]

LGTM, thanks!

[rajathagasthya]

Looks like build/test is failing. Good to merge after that's addressed.

[anujc25]

Thanks for this change. LGTM

[codecov]

Codecov Report

Merging #3261 (407977d) into main (254f018) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3261      +/-   ##
==========================================
- Coverage   45.82%   45.78%   -0.04%     
==========================================
  Files         361      361              
  Lines       37642    37642              
==========================================
- Hits        17249    17235      -14     
- Misses      18820    18829       +9     
- Partials     1573     1578       +5     

Impacted Files	Coverage Δ
pkg/v1/tkg/tkgpackageclient/package_update.go	83.57% <0.00%> (-1.43%)	⬇️
addons/controllers/clusterbootstrap_controller.go	63.90% <0.00%> (-1.06%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.