Feature/issue 198 ordered output

[danielfromearth]

GitHub Issue: #198

Description

This changes the sorting of datasets from using the concatenation dimension (with a current default of mirror_step), to using a time_variable, which can be specified as an argument to the stitchee() function.

Local test steps

Passed automated CI tests run locally.

Overview of integration done

Passed automated CI integration tests.

PR Acceptance Checklist

• Unit tests added/updated and passing.
• Integration testing
• CHANGELOG.md updated
• Documentation updated (if needed).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.01%. Comparing base (9b28863) to head (391e4e0).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #221      +/-   ##
===========================================
+ Coverage    84.92%   85.01%   +0.09%     
===========================================
  Files           11       11              
  Lines          630      634       +4     
===========================================
+ Hits           535      539       +4     
  Misses          95       95              

Flag	Coverage Δ
integration	44.95% <100.00%> (+0.34%)	⬆️
unittests	82.49% <100.00%> (+0.11%)	⬆️

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[ank1m]

• Ran multiple request configurations with 6 retries for each configuration
• Compared 6 retries to each other and every time outputs were "equal" to each other