feat: insight - method to get an insight annotation from an int value

[monsieurtanuki]

What

• In Smoothie we had to implement that method.
• Now we implement that method directly in off-dart.

Impacted file

• insight.dart: implemented the fromInt method for InsightAnnotation

[codecov-commenter]

Codecov Report

Merging #797 (fdf1bcc) into master (a26ec2a) will decrease coverage by 0.13%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #797      +/-   ##
==========================================
- Coverage   74.87%   74.74%   -0.13%     
==========================================
  Files         199      199              
  Lines        7319     7322       +3     
==========================================
- Hits         5480     5473       -7     
- Misses       1839     1849      +10     

Files Changed	Coverage Δ
lib/src/model/insight.dart	48.57% <0.00%> (-4.56%)	⬇️

... and 2 files with indirect coverage changes

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