Add test for bentofile json schema

[phitoduck]

Overview

I wrote a trivial unit test for validating the bentofile.yaml and did a lot of work to make it easy to use the "Test Explorer" sidebar for running and step-debugging individual tests.

I included a guide in the README on the various ways to run tests. Hopefully this reduces the friction for authoring tests for all of our future PRs!

Commits

• feat: added dev dependencies on ajv (json schema validation lib); mocha-test-explorer-launch-scripts (displaying tests in sidebar); ts-node (setting breakpoints in TS tests)
• feat: iterated on bentofileSchema.json and added a trivial test
• test: configured Mocha Test Explorer for VS Code in settings.json
• docs: added guide on testing to the README

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.89%. Comparing base (a64078f) to head (bb73fad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
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  Coverage   26.89%   26.89%           
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  Files          18       18           
  Lines        1937     1937           
  Branches        2        2           
=======================================
  Hits          521      521           
  Misses       1416     1416           

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