WIP: enable linting and bingo management of the lint tool

[grokspawn]

Discovered that the lint make target doesn't lint anything. It only checks whether go imports are in expected grouping/ordering.

This PR introduces gci support (replacing goimports) as a targeted linter, and implements golang-linter support via a bingo-managed version.

There are discrete commits planned for

1. adding lint infrastructure
2. automated lint fixes
3. manual test lint fixes
4. manual functional lint fixes

Description of the change:

Motivation for the change:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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• OWNERS [grokspawn]

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[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 46.80%. Comparing base (a0a503e) to head (c9deb72).

Files with missing lines	Patch %	Lines
pkg/configmap/configmap_writer.go	0.00%	1 Missing ⚠️
pkg/registry/graph.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1524      +/-   ##
==========================================
- Coverage   46.80%   46.80%   -0.01%     
==========================================
  Files         135      135              
  Lines       15760    15752       -8     
==========================================
- Hits         7377     7373       -4     
+ Misses       7342     7338       -4     
  Partials     1041     1041              

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