Move ingest_parallax function here from SIMPLE

@exu-112 has written an excellent [`ingest_parallax` function](https://github.com/SIMPLE-AstroDB/SIMPLE-db/blob/d0e29ba7789d3946009c6352e1d63c30366fd803/simple/utils/astrometry.py#L20) and [tests](https://github.com/SIMPLE-AstroDB/SIMPLE-db/blob/d0e29ba7789d3946009c6352e1d63c30366fd803/tests/test_astrometry.py#L70). The function has good error handling and deals with the adopted column. Parallax table already exists in the template so makes sense to move this function over. Probably best to go ahead and start an `astrometry.py` module.

Start by reading the referenced ingest_parallax implementation in simple/utils/astrometry.py and its tests in tests/test_astrometry.py. Create the proposed astrometry.py module in astrodb_utils and port the function and tests, including adopted-column handling and error cases. Done means the function is available here with its referenced tests passing.

Written by the indexing model from the issue text.