Switch to NPM and Update Dependency Libraries

[cmoesel]

Switch from yarn to NPM and update the dependency libraries to their latest versions.

Did not update node-fetch to 3.x because node-fetch 3.x does not support importing via CommonJS require statements (see README).

[cmoesel]

If you'd like to test this in a CQL project, I've attached a zip here:
run-cql.zip

First, test the baseline (without this PR code):

• Unzip it
• cd into run-cql
• Run npm install to install dependencies
• Export the UMLS_API_KEY environment variable with your UMLS API key as the value
• Run node .
• You should see some data printed out. Ensure that some risk assessments are printed and that Fibromyalgia is printed (near the top).
• Verify that there is a new .vscache folder with some XML files and a JSON file.

Then update the code to use this PR:

• In this PR's source code, run npm install followed by npm pack to create a tgz package.
• The rest of the steps should be done from the example CQL project (i.e., "run-cql")
• Run npm install /your/path/to/cql-exec-vsac-1.2.2.tgz
• Delete the .vsache folder that was created the first time you ran it.
• Re-run node .
• Verify that the printed out results are the same
• Verify that .vscache is recreated with XML files and a JSON file

[jafeltra]

This looks good to me! Thanks for providing the repo to test with. I tried it out and everything seems to work as expected still.