Refactor analysis module

[prasham21]

This pr refactors the gene_blueprints and metabolite_blueprints to separate web dependency code from analysis code.

TODO:

• FIx Docstrings
• Use new analysis code in the WebAPI
• write unit tests for the new code.

[kkaris]

I tried to add the neo4j url as an explicit environment variable, but the NEO4J client still can't find the URL in the test runs.

[kkaris]

The new tests I added are now all failing with this error (they are passing locally for me):

neo4j.exceptions.AuthError: {code: Neo.ClientError.Security.Unauthorized} {message: Unsupported authentication token, missing key `scheme`}

I'm not sure what to make of that, since all I can find on searching this is that there could be typos in the credentials. I've checked the URL and it corresponds to what I have locally, where things work.