Scripts to convert objects to yaml/json ready formats

[profxj]

I propose to add two scripts to astropy.utils.data (or a neighboring module)
that convert Python objects into YAML or JSON ready formats. This code
already exists (with tests and documentation) as:

linetools.utils.jsonify
https://github.com/linetools/linetools/blob/master/linetools/utils.py

and

desiutils.io.yamilfy
https://github.com/desihub/desiutil/blob/master/py/desiutil/io.py

I feel this has general use within the astronomical community (quite
possible that similar routines already exist).

[pllim]

Fast forward to 2019, we already have JSON support for a number of objects:

astropy/astropy/utils/misc.py

Lines 366 to 377 in 31a111c

	class JsonCustomEncoder(json.JSONEncoder):
	"""Support for data types that JSON default encoder
	does not do.
	This includes:
	* Numpy array or number
	* Complex number
	* Set
	* Bytes
	* astropy.UnitBase
	* astropy.Quantity

Is there something in particular that is still missing that you think would benefit the astronomy Python community?