Add a goimportas linter configuration to enforce package import structure

Signed-off-by: timflannagan [email protected]

Description of the change: Add a goimports linter configuration to enforce packages from this repository are grouped correctly.

Motivation for the change: Make PR reviews more streamlined by automating style differences.

Architectural changes:

Testing remarks:

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Bug fixes are accompanied by regression test(s)
• [ ] e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• [ ] tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• [ ] Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• [ ] Docs updated or added to /doc
• [ ] Commit messages sensible and descriptive
• [ ] Tests marked as [FLAKE] are truly flaky and have an issue
• [ ] Code is properly formatted

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: exdx, timflannagan

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/retest-required

Please review the full test history for this PR and help us cut down flakes.

/retest-required

Please review the full test history for this PR and help us cut down flakes.

There's a bunch of code changes that need to be made to make this new linting configuration happy. Holding for now until I have time to revisit this.

/hold