[task #16282] Include ICRS equatorial coordinate type

[Mohammad Akhlaghi]

Follow-up Comment #1, task #16282 (project gnuastro):

A nice review of ICRS in relation to FK5 and J2000 is given in Feissel and
Mignard 1998 <https://ui.adsabs.harvard.edu/abs/1998A%26A...331L..33F>. In
their Figure 1, they show the pole positions in relation to each other. 

We should be able to use these pole positions to convert ICRS to 'eq-j2000'
and from that, to all the other coordinate systems that are currently
recognized.

Some other references: 
* Kaplan 2005 <https://arxiv.org/abs/astro-ph/0602086v1>: a nice review from
the basics and some good history.
* Charlot et al. 2020 <https://doi.org/10.1051/0004-6361/202038368>: the third
realization of ICRS.


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