Add Codecov config and update readme badges

[oddstr13]

This Codecov config should stop coverage from failing PRs, while still showing the information.

Readme

• Add badges for
  • Codecov
  • CodeQL
• Remove whitespace from inside badge a-tag content.
  This makes the readme render nicer (removes single space underlined link between badges), at the cost of code quality/maintainability.
  One alternative would be to move the whitespace into the tags themselves, but that is also not clean.

Readme preview

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.50%. Comparing base (62a1de7) to head (a8982d2).
Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #894   +/-   ##
=======================================
  Coverage   21.50%   21.50%           
=======================================
  Files          63       63           
  Lines        8632     8632           
  Branches     1585     1585           
=======================================
  Hits         1856     1856           
  Misses       6755     6755           
  Partials       21       21           

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