Serialize protobuf enums as integer

[Nevay]

Workaround for #978, traverses the serialized json payload and replaces every enum value with its respective numeric value.

[codecov]

Codecov Report

Merging #1192 (1656be1) into main (d376566) will decrease coverage by 0.39%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1192      +/-   ##
============================================
- Coverage     84.29%   83.90%   -0.39%     
- Complexity     2196     2208      +12     
============================================
  Files           282      282              
  Lines          6245     6274      +29     
============================================
  Hits           5264     5264              
- Misses          981     1010      +29     

Flag	Coverage Δ
7.4	82.55% <0.00%> (-0.39%)	⬇️
8.0	83.83% <0.00%> (-0.39%)	⬇️
8.1	83.96% <0.00%> (-0.40%)	⬇️
8.2	83.96% <0.00%> (-0.40%)	⬇️
8.3	83.96% <0.00%> (-0.40%)	⬇️

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Files	Coverage Δ
src/Contrib/Otlp/ProtobufSerializer.php	17.33% <0.00%> (-10.93%)	⬇️

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