feat instrument pgx CopyFrom

[vinicius-batista]

Links

Closes #825

Details

The implementation and tests was simple but I have a problem running tests when snapshot was already created.
The current installed version from pgsnap fails when read CopyData from snapshot.
At pgsnap's latest version CopyData and other messages were implemented but pgproto is failing to unmarshal CopyInResponse message.

I don't know how to proceed with this implementation as some tests are failing due to external dependencies.

[CLAassistant]

All committers have signed the CLA.

[vinicius-batista]

@iamemilio

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d752b7e) 80.06% compared to head (dc1ed85) 80.37%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #826      +/-   ##
===========================================
+ Coverage    80.06%   80.37%   +0.30%     
===========================================
  Files          136      138       +2     
  Lines        12358    12489     +131     
===========================================
+ Hits          9895    10038     +143     
+ Misses        2180     2169      -11     
+ Partials       283      282       -1     

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[nr-swilloughby]

Thanks for your PR. We'll review it.