Add endpoint to 'search' for gift card code

[loevgaard]

No description provided.

[codecov]

Codecov Report

Merging #141 (c0240fe) into support-sylius-1-10 (9e4e645) will not change coverage.
The diff coverage is n/a.

@@                  Coverage Diff                   @@
##             support-sylius-1-10     #141   +/-   ##
======================================================
  Coverage                  16.81%   16.81%           
  Complexity                   371      371           
======================================================
  Files                         67       67           
  Lines                       1219     1219           
======================================================
  Hits                         205      205           
  Misses                      1014     1014           

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