`Observable_interval` function added and `months_observable` aliased#531

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tygger7 wants to merge 7 commits intoastropy:mainfrom

tygger7:observable_interval

Commits on Nov 4, 2022

code style changes for tox checks
tygger7
authored

Commits on Nov 7, 2022

code style updates
tygger7
authored

Commits on Dec 5, 2022

Merge branch 'astropy:main' into observable_interval
tygger7
authored