Parse command should return manifest when invoked via dbtRunner

[iknox-fa]

resolves #6547

Description

Allows easy programmatic access to the manifest as generated by the cli.requires.manifest decorator. Currently a very, VERY simple implementation.

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[stu-k]

I'm sure this could benefit from a test somewhere, but this implementation looks correct 👍

[iknox-fa]

I'm sure this could benefit from a test somewhere, but this implementation looks correct 👍

I was thinking about that, but I'm not sure what I could test that wasn't already handled by the functional tests for every command that uses a manifest-- Other than that, it's just basic passthrough logic.

If you think of a useful thing to test, let me know; I'm certainly not opposed to more testing.