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Do not allocate a return function from `ExportSpans` to the heap. Use
the added `ExportOp` type instead.
### Benchmarks
#### `stdouttrace`
```terminal
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/exporters/stdout/stdouttrace
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ sec/op │ sec/op vs base │
ExporterExportSpans/Observability-8 23.37µ ± 2% 22.79µ ± 3% -2.50% (p=0.025 n=10)
ExporterExportSpans/NoObservability-8 23.07µ ± 7% 22.29µ ± 1% -3.38% (p=0.000 n=10)
geomean 23.22µ 22.54µ -2.94%
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ B/op │ B/op vs base │
ExporterExportSpans/Observability-8 4.253Ki ± 0% 4.190Ki ± 0% -1.47% (p=0.000 n=10)
ExporterExportSpans/NoObservability-8 3.975Ki ± 0% 3.975Ki ± 0% ~ (p=0.474 n=10)
geomean 4.111Ki 4.081Ki -0.74%
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ allocs/op │ allocs/op vs base │
ExporterExportSpans/Observability-8 67.00 ± 0% 66.00 ± 0% -1.49% (p=0.000 n=10)
ExporterExportSpans/NoObservability-8 64.00 ± 0% 64.00 ± 0% ~ (p=1.000 n=10) ¹
geomean 65.48 64.99 -0.75%
¹ all samples are equal
```
#### `stdouttrace/internal/observ`
```terminal
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/exporters/stdout/stdouttrace/internal/observ
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ sec/op │ sec/op vs base │
InstrumentationExportSpans/NoError-8 197.9n ± 7% 153.3n ± 5% -22.51% (p=0.000 n=10)
InstrumentationExportSpans/PartialError-8 754.4n ± 6% 663.2n ± 6% -12.08% (p=0.001 n=10)
InstrumentationExportSpans/FullError-8 772.8n ± 4% 669.2n ± 4% -13.39% (p=0.000 n=10)
geomean 486.8n 408.3n -16.13%
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ B/op │ B/op vs base │
InstrumentationExportSpans/NoError-8 64.00 ± 0% 0.00 ± 0% -100.00% (p=0.000 n=10)
InstrumentationExportSpans/PartialError-8 280.0 ± 0% 216.0 ± 0% -22.86% (p=0.000 n=10)
InstrumentationExportSpans/FullError-8 280.0 ± 0% 216.0 ± 0% -22.86% (p=0.000 n=10)
geomean 171.2 ? ¹ ²
¹ summaries must be >0 to compute geomean
² ratios must be >0 to compute geomean
│ main.bmark.results │ stdouttrace-optimize-end.bmark.results │
│ allocs/op │ allocs/op vs base │
InstrumentationExportSpans/NoError-8 1.000 ± 0% 0.000 ± 0% -100.00% (p=0.000 n=10)
InstrumentationExportSpans/PartialError-8 3.000 ± 0% 2.000 ± 0% -33.33% (p=0.000 n=10)
InstrumentationExportSpans/FullError-8 3.000 ± 0% 2.000 ± 0% -33.33% (p=0.000 n=10)
geomean 2.080 ? ¹ ²
¹ summaries must be >0 to compute geomean
² ratios must be >0 to compute geomean
```