Test e2e: TDF inspect

[jakedoublev]

Background

We recently added support for BATS e2e tests, with a few test runs currently in the pipeline. We need to add e2e tests for the critical paths within policy for a TDF being formed correctly and able to be inspected.

Acceptance Criteria

• attr values added to a TDF on encrypt (each type) are present on TDF inspect
• happy paths inspect
• KAS grants added to values on a TDF are found within inspect
• executable .bats file added with non-flaky tests that don't interfere with other runs