Adding circlar ports with flange gap option

[shimwell]

Proposed changes

Adds a circular port parametric component that is a pipe with a flange. An svg image was made with and can be uploaded to the docs later

component.export_svg('/home/jshimwell/paramak/port.svg', projectionDir=(-0.1, -0.45, 1))

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

Merging #215 (b7aa664) into develop (d3312da) will increase coverage by 0.49%.
The diff coverage is 90.90%.

❗ Current head b7aa664 differs from pull request most recent head 37e4488. Consider uploading reports for the commit 37e4488 to get more accurate results

@@             Coverage Diff             @@
##           develop     #215      +/-   ##
===========================================
+ Coverage    95.60%   96.10%   +0.49%     
===========================================
  Files           79       80       +1     
  Lines         5281     5336      +55     
===========================================
+ Hits          5049     5128      +79     
+ Misses         232      208      -24     

Impacted Files	Coverage Δ
paramak/parametric_components/circular_port.py	90.74% <90.74%> (ø)
paramak/__init__.py	94.38% <100.00%> (+0.06%)	⬆️
paramak/shape.py	95.21% <0.00%> (+1.88%)	⬆️
paramak/utils.py	94.89% <0.00%> (+2.91%)	⬆️
paramak/reactor.py	77.44% <0.00%> (+3.36%)	⬆️

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