create a sqlcmd style linter

[shueybubbles]

Fixes #214

• Iteration 1 adds a basic linter skeleton with one linter that flags use of non-assert test failure methods like t.Fatalf
• Adds use of the linter to build\build.cmd to print out any warnings. Once we are clean we can convert the linter run to a step in the PR validation pipeline.
• Iteration 2 will add enforcement of package import/hierarchy rules.

[stuartpa]