RePORTER query scripts

[Bankso]

This PR adds two scripts that can be used for collecting grant information from the NIH RePORTER API:

• reporter_project_query.py: queries the RePORTER API projects endpoint for grant information and returns the results as a CSV
• clean_reporter_results.py: takes the CSV from RePORTER, removes outdated and redundant entries, and returns a CSV

While the scripts were designed for the specific purpose of collecting subproject_id values, the input arguments and JSON payload content in reporter_project_query.py can be modified to capture other information available from the RePORTER API. The extractions and filtering criteria in clean_reporter_results.py can also be adjusted, if needed. As such, I imagine these scripts can be extended to capture most or all of the GrantView and ProjectView metadata we record.

[Bankso]

@aclayton555 @aditigopalan @vpchung This PR isn't urgent - I just forgot to request a review when I put it together.

[Bankso]

Thank you for your comments, @vpchung!