Implement resource serialization for stdoutlog

[XSAM]

resolves #5211

Adding tests for this behavior is not easy until a test record structure like #5200 is implemented. I will include the test on #5212.

[pellared]

Tests are failing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.5%. Comparing base (6e92163) to head (4a7013e).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5213     +/-   ##
=======================================
- Coverage   85.5%   85.5%   -0.1%     
=======================================
  Files        258     258             
  Lines      17030   17031      +1     
=======================================
  Hits       14570   14570             
- Misses      2152    2153      +1     
  Partials     308     308             

Files	Coverage Δ
exporters/stdout/stdoutlog/record.go	100.0% <100.0%> (ø)

... and 3 files with indirect coverage changes

[pellared]

@open-telemetry/go-approvers This needs a review from a non-Splunker.