test(snapshot): Use snapshot testing in sdk-common

[BillCarsonFr]

Tentative to introduce snapshot testing using insta.rs.
Added some initial doc on the Contributing.md file

As a draft now, because I have some open questions on how to do things.

I need also to see what to do for CI

Insta behaves differently in CI environments. For instance it will not write new snapshot files. This behavior is enabled by the CI environment variable. Please ensure that your CI system sets it.

export CI=true

• Public API changes documented in changelogs (optional)

Signed-off-by:

[poljar]

Nice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.43%. Comparing base (f2942db) to head (3b31bbe).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4428      +/-   ##
==========================================
+ Coverage   85.41%   85.43%   +0.01%     
==========================================
  Files         283      283              
  Lines       31559    31559              
==========================================
+ Hits        26955    26961       +6     
+ Misses       4604     4598       -6     

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[poljar]

Looks good. Thanks for adding this.