reports: add type statistics to report file

[rzeAkbari]

Proposed changes

Mutant type statistics are added in the root of the file. zero values are omitted

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)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes (make all)
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

[codecov]

Codecov Report

Merging #185 (d06585d) into main (a02a1b0) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   88.27%   88.53%   +0.25%     
==========================================
  Files          18       18              
  Lines        1288     1317      +29     
==========================================
+ Hits         1137     1166      +29     
  Misses        126      126              
  Partials       25       25              

Flag	Coverage Δ
unittests	88.53% <100.00%> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/report/report.go	100.00% <100.00%> (ø)

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[k3rn31]

I believe it is better if we put the mutator statistics in a sub object of the report.

[codeclimate]

Code Climate has analyzed commit d06585d and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (70% is the threshold).

This pull request will bring the total coverage in the repository to 90.5% (0.2% change).

View more on Code Climate.

[k3rn31]

Closed #134