Adding Object Oriented Plotting to various features

[Gaurav17Joshi]

Adding Object Oriented Plotting to lightcurve plotting

Addressing #612, This Pr will add object oriented methods to stingray.lightcurve.py

[codecov[bot]]

Codecov Report

Merging #703 (e9c352c) into main (fb98a57) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #703      +/-   ##
==========================================
+ Coverage   97.21%   97.23%   +0.01%     
==========================================
  Files          42       42              
  Lines        7797     7800       +3     
==========================================
+ Hits         7580     7584       +4     
+ Misses        217      216       -1     

Impacted Files	Coverage Δ
stingray/lightcurve.py	98.13% <100.00%> (+0.16%)	:arrow_up:

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[matteobachetti]

Thanks @Gaurav17Joshi for the PR. However, this should be superseded by the more general machinery introduced in #754.