Adding dates functionality.

[astronomerritt]

Fixes #36.

• You can now specify a date range, either on the command line or when creating an AdlerPlanetoid object in a Jupyter notebook.
• This is done on the command line with the -d --date_range argument (where you simply follow the flag with two numbers) or on AdlerPlanetoid by passing date_range=[<min_date>, <max_date>] to construct_from_RSP().
• Dates should be in MJD(TAI).

Review Checklist for Source Code Changes

• Does pip install still work?
• Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• Does adler run successfully on a test set of input files/databases?
• Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 68.75%. Comparing base (b080dda) to head (c7f11cf).

Files	Patch %	Lines
src/adler/adler.py	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   69.84%   68.75%   -1.10%     
==========================================
  Files           3        3              
  Lines          63       64       +1     
==========================================
  Hits           44       44              
- Misses         19       20       +1     

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[astronomerritt]

Drafting this as I may have found a bug...

[astronomerritt]

Fixed it.

[jrob93]

Looks good to me!