Instrument the SimpleLogProcessor from sdk/log

[yumosx]

ref #7016

goarch: amd64
pkg: go.opentelemetry.io/otel/sdk/log
cpu: Intel(R) Core(TM) i7-14700
                                                │ before.txt  │  .\after_res.txt   │
                                                │   sec/op    │   sec/op     vs base   │
SimpleProcessorObservability/NoObservability-28   27.68n ± 4%
SimpleProcessorObservability/Observability-28                   27.39n ± 5%
geomean                                           27.68n        27.38n       ? ¹ ²
¹ benchmark set differs from baseline; geomeans may not be comparable
² ratios must be >0 to compute geomean

                                                │  before.txt  │   .\after_res.txt   │
                                                │     B/op     │    B/op     vs base │
SimpleProcessorObservability/NoObservability-28   0.000 ± 0%
SimpleProcessorObservability/Observability-28                    0.000 ± 0%
geomean                                                      ¹               ? ² ¹ ³
¹ summaries must be >0 to compute geomean
² benchmark set differs from baseline; geomeans may not be comparable
³ ratios must be >0 to compute geomean

                                                │  before.txt  │   .\after_res.txt   │
                                                │  allocs/op   │ allocs/op   vs base │
SimpleProcessorObservability/NoObservability-28   0.000 ± 0%
SimpleProcessorObservability/Observability-28                    0.000 ± 0%
geomean                                                      ¹               ? ² ¹ ³
¹ summaries must be >0 to compute geomean
² benchmark set differs from baseline; geomeans may not be comparable
³ ratios must be >0 to compute geomean

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.1%. Comparing base (df83919) to head (74be235).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sdk/log/simple.go	83.3%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7548     +/-   ##
=======================================
- Coverage   86.1%   86.1%   -0.1%     
=======================================
  Files        298     298             
  Lines      21694   21709     +15     
=======================================
+ Hits       18694   18706     +12     
- Misses      2624    2626      +2     
- Partials     376     377      +1     

Files with missing lines	Coverage Δ
sdk/log/internal/observ/simple_log_processor.go	100.0% <100.0%> (ø)
sdk/log/simple.go	94.2% <83.3%> (-5.8%)	⬇️

... and 3 files with indirect coverage changes

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[flc1125]

The remaining two issues.