Refactor private functions

[LanderOtto]

This commit changes some functions from private to public because they were used across different files

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.44%. Comparing base (e2b5a8b) to head (4f422ce).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
streamflow/core/utils.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #684       +/-   ##
===========================================
- Coverage   71.47%   61.44%   -10.04%     
===========================================
  Files          88       88               
  Lines       11358    11360        +2     
  Branches     1985     1985               
===========================================
- Hits         8118     6980     -1138     
- Misses       2782     3930     +1148     
+ Partials      458      450        -8     

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