356 create json schemas for import

[rbroth]

I've made a first pass at creating JSON schemas from the markdown tables previously in /doc/import-templates/import-template.md. They're pretty basic, but should allow us to make a start on standardizing data import a bit more.

Note that I haven't tested these against actual data yet, so they may not be accurate

General Checklist

• [x] Database objects and columns have comments (or not applicable)
• [x] The project README.md has been updated to reflect any changes (or not applicable)

[rbroth]

Just realized that I've used the markdowntables from the db-architecture repo; there are also markdwon tables in the data import repo. Will compare and try to fix

[rbroth]

Ok, Obviously these are a work in progress and we'll work out the kinks as we go

[rbroth]

I've been testing the fooditem schema, and it's looking pretty good! Problems identified: there's an extra column (data_reference_original_id) that I don't believe we're actually importing yet; andsome entries for food_genus_confidence use h/m/l instead of High medium Low.

A problem I've run into is dynamic typing. Because not all strings are quoted, at the moment I'm using pandas to dynamically get the column type. There are also difference in how different libraries handle null values: pandas recognizes NA as null, but most everything else does not. Some libraries import empty cells (i.e. ,,) as empty strings. There's more that can be done, but I think the current implementation is enough to work together with the scientists and see if we can get something going

[rbroth]

@bgsandan are you ok with this being merged?