[receivertest] add metrics support to contract_checker

[atoulme]

trafficstars

Description: add support for metrics in contract checker

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.87%. Comparing base (de6287d) to head (d2ec5da). Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9551      +/-   ##
==========================================
+ Coverage   90.41%   90.87%   +0.46%     
==========================================
  Files         347      347              
  Lines       18184    18325     +141     
==========================================
+ Hits        16441    16653     +212     
+ Misses       1412     1346      -66     
+ Partials      331      326       -5     

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