chore(CI): add gci formatter

[Elbehery]

This PR add gci import formatter to this repo.

See etcd-io/bbolt#988 (comment)

cc @ahrtr @ivanvc

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.28%. Comparing base (52ce705) to head (b64a02a).
Report is 2 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/osutil/interrupt_unix.go	81.48% <ø> (ø)

... and 45 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20179      +/-   ##
==========================================
+ Coverage   68.41%   69.28%   +0.87%     
==========================================
  Files         408      413       +5     
  Lines       34167    34367     +200     
==========================================
+ Hits        23375    23812     +437     
+ Misses       9385     9163     -222     
+ Partials     1407     1392      -15     

---

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[ahrtr]

LGTM

thx @Elbehery

cc @ivanvc @jmhbnz

[jmhbnz]

LGTM - Thanks @Elbehery

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, Elbehery, jmhbnz

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