feat(#107): Adds multi-db watcher support

[dianabarsan]

Adds watcher for continuous doc import. Watcher has a timeout of 5 seconds between tries. Adds multi database support. Ignores postgres deadlock errors, and adds retry.

Updates e2e tests to:

• not use two additional containers to push data to CouchDb, that used python to push data
• not have data in a zipped file, where it's literally invisible to the developer. instead using scalability csv docs, and using cht-conf to generate documents that get uploaded before the test runs.
• updates test to wait until DBT processing is complete and checks number of results.

107

[dianabarsan]

I agree with the whole weirdness around e2e tests in this repo depending on another repository. I really struggled not to make this change in this iteration, because I wanted to keep this relatively contained to the watcher + multi db support.

I think the simplest solution right now is to have a sort of test-branch for cht-pipeline instead of passing main to e2e tests here. But the best would be to somehow source the DBT models to this repo.

[medic-ci]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on GitHub release

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