Understand import aliases for ordered-imports.

[mihneadb]

PR checklist

• Addresses an existing issue: fixes Expand ordered-imports to support import alias = a.b.c.d; #4591
  • Includes tests
• Documentation update -- nothing to add I think

Overview of change:

This enhances the behavior of ordered-imports to also lint import aliases such as import X = Module.X.
Without this, code bases having import aliases in them cannot be automatically linted/fixed by the current ordered-imports rule.

CHANGELOG.md entry:

[enhancement], [rule-change]

[palantirtech]

Thanks for your interest in palantir/tslint, @mihneadb! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[mihneadb]

Signed the CLA.

[JoshuaKGoldberg]

Marking as in discussion pending resolution of some open points in #4591.