Add script to count test plans, tests, assertions, and command/assertion pairs

[s3ththompson]

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This PR adds a script to the scripts directory which provides basic metrics for all test plans or a single specified test plan.

The output of this script can be used to track the growth of the ARIA-AT repository over time.

Example output:

$ npm run count
8 test plans, 242 tests, 919 assertions, 1643 command/assertion pairs

[jscholes]

1643 command/assertions

@s3ththompson What does that mean? What is a "command/assertion"?

[s3ththompson]

@jscholes was trying to think of a better name for that... it's basically number of commands times number of assertions in order to count the total number of distinct data points that are collected. i'll happy replace the wording if you have any suggestions!

[jscholes]

@s3ththompson Hmm, tricky one. Reading your response, what comes to mind immediately is "command/assertion pairs". Or just "datapoints", which is so vague that it all but forces users to read the documentation (and would need to be documented accordingly).

[s3ththompson]

@jscholes I like "command/assertion pairs" better. I updated the script to use that terminology.

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[mzgoddard]

I am going to post a commit here with my suggested changes.