Enh/motor parameters from eng files by default

[juliomachad0]

Pull request type

• [x] Code changes (bugfix, features)

Checklist

• [x] Lint (black rocketpy/ tests/) has passed locally
• [x] All tests (pytest tests -m slow --runslow) have passed locally

Current behavior

the static method to create motors from eng files did not exist.

New behavior

method created and working

Breaking change

• [x] No

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.18919% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.47%. Comparing base (3a4c742) to head (7e33586). Report is 43 commits behind head on develop.

Files with missing lines	Patch %	Lines
rocketpy/motors/motor.py	89.18%	4 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #676      +/-   ##
===========================================
- Coverage    75.87%   74.47%   -1.41%     
===========================================
  Files           85       89       +4     
  Lines        10085    10369     +284     
===========================================
+ Hits          7652     7722      +70     
- Misses        2433     2647     +214     

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