Add support for additional TESS HLSP light curves: DIAMANTE, PATHOS, CDIPS, TASOC

This is a follow-up of #912.

Several excellent sets of TESS community light curves are now available at MAST as High Level Science Products. We already support searching and opening SPOC and QLP products via Lightkurve’s search_lightcurve function, but it would be very valuable to also support the following recent HLSPs which provide light curve files:

• DIAMANTE (In progress: #1021)
• PATHOS (Done: #935)
• CDIPS (Done: #980)
• TASOC (Done: #939)
• HALO (e.g. Aldebaran)

The following steps are needed to add support for any of these

1. Add a custom reader function for each product type as lightkurve/io/*NAME*.py.
2. Register the custom reader in lightkurve/io/__init__.py.
3. Update lightkurve/io/detect.py and lightkurve/io/read.py to detect the products correctly.
4. Add unit tests.

Help is welcome in the form of PRs. One for each product, please!

[barentsen]

@stephtdouglas Good news: I went ahead and added time_column and flux_err_column arguments to read_generic_lightcurve(). (Make sure to branch off the latest version of master if you decide to work on this!)

[barentsen]

@stephtdouglas Nobody has started working on this yet, and it would be really cool to add this to Lightkurve. I would be delighted to review and merge a PR if you were interested in preparing one! 👍

The existing readers located under lightkurve/io/xxxxx.py should give you a pretty good example of what the readers might looks like (assuming they are FITS files as well?) Let me know if you have questions!