Switch to relative imports for code within the package

[ewu63]

Purpose

I switched to using relative imports for the code inside the package. Things like examples or tests are outside of the package and therefore do not use relative imports.

Expected time until merged

A few days

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the code adheres to PEP-8 and is consistently formatted
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #149 (48858b1) into main (c1547bc) will not change coverage.
The diff coverage is 60.00%.

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   63.72%   63.72%           
=======================================
  Files          47       47           
  Lines       11676    11676           
=======================================
  Hits         7441     7441           
  Misses       4235     4235           

Impacted Files	Coverage Δ
pygeo/mphys/mphys_dvgeo.py	0.00% <0.00%> (ø)
pygeo/parameterization/DVGeoCST.py	88.78% <100.00%> (ø)
pygeo/parameterization/designVars.py	77.65% <100.00%> (ø)

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