Provide drop_empty_siblings argument

[delucchi-cmu]

Change Description

Closes astronomy-commons/hats#302
Closes #269

Solution Description

Adds drop_empty_siblings argument to binning calculation, as added in astronomy-commons/hats#304.

Increases the default highest_order s.t. users are unlikely to need to change it, and clarifies behavior in the docstrings.

Code Quality

• I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.72%. Comparing base (8a34d62) to head (bd9eea8).
Report is 56 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          26       26           
  Lines        1454     1456    +2     
=======================================
+ Hits         1450     1452    +2     
  Misses          4        4           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.