Summary: This should keep our imports consistently ordered.

Test Plan:
Edit a go file and intentionally mess up import order. Run `arc lint`
Ensure that the goimports linter fires and catches the error and suggests a patch
to fix the order.

Reviewers: zasgar, michelle

Reviewed By: zasgar

Differential Revision: https://phab.corp.pixielabs.ai/D7711

GitOrigin-RevId: 64c571407764161363decb3d1dca77db6c34d3d2