Add SightGlass metadata checks to comstockpostproc

[asparke2]

Add the SightGlass metadata checks to comstockpostproc. The goal is to perform these checks while the data is still in memory, and before waiting on an upload to S3. These checks should be doable on a per-upgrade basis, which will be consistent with the refactor planned to reduce memory consumption.

[wenyikuang]

Need double confirm about questions, then could finish.