Rad

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- This PR removes reference file and guidewindow db tables from cal_step schemas. [420]

- Separated TVAC and FPS schemas into their own suite of files. [414]

- Fixed the TVAC & FPS archive catalog destinations. [424]

- Added statistics schemas to both FPS and TVAC. [423]

- Removed filepath_level_pnt5 from TVAC/FPS database. [422]

- Removed the db entries for filename_l1a and filename_pnt5 in TVAC and FPS schemas. [421]

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- Updated RTD with documentation for new data products. [419]

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- Duplicated the keywords from groundtest to tvac_groundtest. [409]

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- Duplicated the keywords from base_exposure to exposure and similarly for base_guidestar and guidestar. [406]

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- Add new schemas to documentation. [386]

- Convert tag keywords to wildcards for external tags. [370]

- Added ``exact_datatype`` arguments to prevent ASDF from casting array
datatypes during save. [369]

- Add documentation on how to create a new schema. [375]

- Add ``FPS`` and ``TVAC`` schemas. [364]

- Update titles and descriptions to those provided by INS. [361]

- Updated product table names. [382]

- Changed image units from e/s to DN/s (and added support for MJy/sr). [389]

- Add attributes under the ``basic`` schema to ``WfiMosaic.meta``. [390]

- Split cal_step into L2 and L3 versions. [397]

- Add Members Keyword to Resample Schema. [396]

- Create the flux step schema. [395]

- Create ``outlier_detection`` schema and add bit mask field to both it and ``resample``. [401]

- Add source_catalog and segmentation_map schemas for Level 2 and Level 3 files. [393]