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There are a finite set of attributes that can be recorded with self
observability instruments. Cache these combinations to avoid computation
and allocations on the hot-path of tracing.
### Benchmarks
```console
$ benchstat main_25d02741f.txt cache-trace-obs-sets_05fd6ee.txt
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/sdk/trace
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
│ main_25d02741f.txt │ cache-trace-obs-sets_05fd6ee.txt │
│ sec/op │ sec/op vs base │
SpanEnd/SelfObservabilityEnabled-8 366.2n ± 5% 229.2n ± 3% -37.39% (p=0.000 n=10)
TraceStart/SelfObservabilityEnabled-8 1076.0n ± 2% 800.2n ± 2% -25.63% (p=0.000 n=10)
geomean 627.7n 428.3n -31.76%
│ main_25d02741f.txt │ cache-trace-obs-sets_05fd6ee.txt │
│ B/op │ B/op vs base │
SpanEnd/SelfObservabilityEnabled-8 192.00 ± 0% 64.00 ± 0% -66.67% (p=0.000 n=10)
TraceStart/SelfObservabilityEnabled-8 992.0 ± 0% 608.0 ± 0% -38.71% (p=0.000 n=10)
geomean 436.4 197.3 -54.80%
│ main_25d02741f.txt │ cache-trace-obs-sets_05fd6ee.txt │
│ allocs/op │ allocs/op vs base │
SpanEnd/SelfObservabilityEnabled-8 4.000 ± 0% 2.000 ± 0% -50.00% (p=0.000 n=10)
TraceStart/SelfObservabilityEnabled-8 9.000 ± 0% 5.000 ± 0% -44.44% (p=0.000 n=10)
geomean 6.000 3.162 -47.30%
```