Refactoring: Moves execution to a separate module.

Created by: stefanoborini

Two refactorings:

• moves the execute_workflow routine in a separate module
• changes the name and parameter ordering of layer execution.

Created by: codecov[bot]

Codecov Report

Merging #161 into master will increase coverage by 0.03%. The diff coverage is 95.83%.

@@            Coverage Diff            @@
##           master    #161      +/-   ##
=========================================
+ Coverage   92.17%   92.2%   +0.03%     
=========================================
  Files          38      39       +1     
  Lines        1010    1014       +4     
  Branches       66      66              
=========================================
+ Hits          931     935       +4     
  Misses         75      75              
  Partials        4       4

Impacted Files	Coverage Δ
force_bdss/api.py	100% <100%> (ø)
force_bdss/core_evaluation_driver.py	84.61% <100%> (-6.9%)
force_bdss/core/execution.py	95.71% <95.71%> (ø)

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