Expose TOML test files as an integration test suite

[pfeairheller]

The recorded HTTP interactions between the SignifyPy client and KERIA agent could serve as a good interop test suite between Signify clients.

We should consider how to automate the generation of these files and how to expose / share them for all Signify clients.

[2byrds]

Two streams related to this. We have an integration.sh bash script that makes standing up the KERI network components (witnesses and keria) fairly easy and allows a user to select which test to run. perhaps we could add a 'generate toml files' option that runs the tests that produce those files (test_witnesses, test_delegation, etc).
I'm also in the middle of trying to make the unit tests not need those files anymore, instead standing up a fresh witness network and keria instance for each test..... effectively doing the same thing as the integration tests but without using TOML files at all.
Happy to discuss the best route and/or mixed strategy.