Add an input job validator function

[dfsnow]

Add a function to the extraction pipeline that takes a job definition JSON/dictionary as input, then validates it against the criteria outlined in config/table_definitions.yaml. The goal is to raise exceptions early when passing jobs that are invalid for a given table.

Some possible checks to make:

• min_year should always be <= max_year
• Job batches should contain only a single job for a given table
• Jobs are within the parameters outlined in config/table_definitions.yaml
• taxyr values are numeric (and years)
• cur values are one of Y, N, or D