ci: setup codecov

[marksie1988]

Description

Adds codecov configurations to show test coverage data

Related issues

closes #117

Type of change

• Bug fix (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)
• CI / Tests update
• Documentation update

How has this been tested

• I have added new tests where required
• I have run nox -s tests locally and passed
• I have tested this feature in a python script

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ff905d1). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #134   +/-   ##
=========================================
  Coverage          ?   92.67%           
=========================================
  Files             ?       15           
  Lines             ?      996           
  Branches          ?        0           
=========================================
  Hits              ?      923           
  Misses            ?       73           
  Partials          ?        0           

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