GEOPY-2314: Speed up saving directive by keeping the file open during series

[domfournier]

GEOPY-2314 - Speed up saving directive by keeping the file open during series

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.76%. Comparing base (f0ac9ff) to head (e79b799).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #236      +/-   ##
===========================================
+ Coverage    90.74%   90.76%   +0.02%     
===========================================
  Files           92       92              
  Lines         5574     5587      +13     
  Branches       694      696       +2     
===========================================
+ Hits          5058     5071      +13     
  Misses         333      333              
  Partials       183      183              

Files with missing lines	Coverage Δ
...drivers/components/factories/directives_factory.py	96.06% <100.00%> (+0.17%)	⬆️
simpeg_drivers/joint/driver.py	93.88% <100.00%> (+0.02%)	⬆️
simpeg_drivers/joint/joint_petrophysics/driver.py	98.13% <100.00%> (+0.01%)	⬆️

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