DefaultOpenTelemetryFactory should allow to override histogram buckets

[tompoch]

Feature description

The DefaultOpenTelemetryFactory does not provide any means to call AutoConfiguredOpenTelemetrySdkBuilder#addMeterProviderCustomizer while creating the OpenTelemetry instance.

In my case I would like to register view for one of the histograms reported to use other than default buckets (ExplicitBucketHistogramUtils#DEFAULT_HISTOGRAM_BUCKET_BOUNDARIES)

As a workaround I am using the following factory

    @Singleton
    @Replaces(value = OpenTelemetry.class, factory = DefaultOpenTelemetryFactory.class)
    protected OpenTelemetry openTelemetryWithViews(ApplicationConfiguration applicationConfiguration,
            @Property(name = "otel") @MapFormat(transformation = FLAT) Map<String, String> otelConfig,
            @Nullable IdGenerator idGenerator,
            @Nullable SpanProcessor spanProcessor,
            @Nullable ResourceProvider resourceProvider,
            List<ViewRegistration> viewRegistrations) {

        Map<String, String> otel = otelConfig.entrySet().stream().collect(Collectors.toMap(
                e -> "otel." + e.getKey(),
                Map.Entry::getValue
        ));

        otel.putIfAbsent(SERVICE_NAME_KEY, applicationConfiguration.getName().orElse(""));
        otel.putIfAbsent(DEFAULT_TRACES_EXPORTER, NONE);
        otel.putIfAbsent(DEFAULT_METRICS_EXPORTER, NONE);
        otel.putIfAbsent(DEFAULT_LOGS_EXPORTER, NONE);

        AutoConfiguredOpenTelemetrySdkBuilder sdk = AutoConfiguredOpenTelemetrySdk.builder()
                .setResultAsGlobal(Boolean.parseBoolean(otel.getOrDefault(REGISTER_GLOBAL, StringUtils.FALSE)))
                .addPropertiesSupplier(() -> otel)
                .addTracerProviderCustomizer((tracerProviderBuilder, ignored) -> {
                            if (idGenerator != null) {
                                tracerProviderBuilder.setIdGenerator(idGenerator);
                            }
                            if (spanProcessor != null) {
                                tracerProviderBuilder.addSpanProcessor(spanProcessor);
                            }
                            if (resourceProvider != null) {
                                tracerProviderBuilder.setResource(resourceProvider.resource());
                            }
                            return tracerProviderBuilder;
                        }
                )
                .addMeterProviderCustomizer((sdkMeterProviderBuilder, configProperties) -> {
                            viewRegistrations.forEach(
                                    vr -> sdkMeterProviderBuilder.registerView(vr.getSelector(), vr.getView()));
                            return sdkMeterProviderBuilder;
                        }
                );

        return sdk.build().getOpenTelemetrySdk();
    }