feat: Add Zap logger formatter with an example.

[muratmirgun]

Title
feat: Add Zap logger integration

Description
This PR introduces official support for the Zap logging library, allowing oops.OopsError to be logged with structured context and stack traces using Zap's high-performance field system.

Changes:

Implemented loggers/zap package with OopsMarshalFunc and OopsStackMarshaller.
Added comprehensive unit tests and benchmarks for the Zap formatter.
Added a full usage example in examples/zap.
Updated go.work to include the new modules.
Fixed a brittle test in stacktrace_test.go that failed when the build path didn't contain the module name.

[codecov]

Codecov Report

❌ Patch coverage is 68.96552% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.08%. Comparing base (2abf8f2) to head (9c99cb0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
loggers/zap/formatter.go	68.96%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   85.57%   85.08%   -0.50%     
==========================================
  Files          13       14       +1     
  Lines         943      972      +29     
==========================================
+ Hits          807      827      +20     
- Misses        112      119       +7     
- Partials       24       26       +2     

Flag	Coverage Δ
unittests	85.08% <68.96%> (-0.50%)	⬇️

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