Autoconfigure listener

[jack-berg]

Resolves #5862, #5021.

Add a new (experimental) interface called AutoConfigureListener. This is not a standalone SPI. Instead, implementations of existing SPIs can additionally implement AutoConfigureListener. By doing so, they get a callback to the autoconfigured OpenTelemetrySdk instance.

Why have SPI implementations implement an additional interface instead of adding a new SPI? If we were to introduce a new standalone SPI, each SPI implementation that needs a callback would have to hold a reference to their configured SDK components in a static variable, and update those references with OpenTelemetrySdk in the callback.

With the strategy in this PR, the same SPI implementation instance that configured the SDK component is invoked with the OpenTelemetrySdk, so it only has to hold class instance references to the configured SDK components.

See OtlpLogRecordExporterProvider, OtlpSpanExporterProvider for how this would work in practice.

I figure we incubate this for a bit before committing to the API.

If we agree with this strategy, I can followup with another PR to update ZipkinSpanExporterProvider.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...ry/exporter/internal/grpc/GrpcExporterBuilder.java	95.40% <100.00%> (ø)
...ry/exporter/internal/http/HttpExporterBuilder.java	89.24% <100.00%> (ø)
...exporter/jaeger/JaegerGrpcSpanExporterBuilder.java	81.25% <100.00%> (ø)
...lp/http/metrics/OtlpHttpMetricExporterBuilder.java	95.74% <100.00%> (ø)
...r/otlp/internal/OtlpLogRecordExporterProvider.java	100.00% <100.00%> (ø)
...rter/otlp/internal/OtlpMetricExporterProvider.java	100.00% <ø> (ø)
...porter/otlp/internal/OtlpSpanExporterProvider.java	100.00% <100.00%> (ø)
...er/otlp/metrics/OtlpGrpcMetricExporterBuilder.java	100.00% <100.00%> (ø)
...elemetry/sdk/autoconfigure/internal/SpiHelper.java	100.00% <100.00%> (ø)
...lp/http/logs/OtlpHttpLogRecordExporterBuilder.java	92.10% <50.00%> (+0.67%)	⬆️
... and 4 more

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