Rework OTel exporter API and documentation

[jeanbisutti]

No description provided.

[jeanbisutti]

cc @lmolkova

[azure-sdk]

API change check

API changes are not detected in this pull request.

[jeanbisutti]

@lmolkova

AzureMonitor provides a high-level API to enable Azure Monitor for OpenTelemetry autoconfiguration:

AutoConfiguredOpenTelemetrySdkBuilder sdkBuilder = AutoConfiguredOpenTelemetrySdk.builder();

OpenTelemetry openTelemetry = new AzureMonitor().connectionString("{connection-string}")
                                      .configure(sdkBuilder).build().getOpenTelemetrySdk();

We expect that most users will use the OpenTelemetry autoconfiguration.

AzureMonitorExporterBuilder provides a low-level API to create OpenTelemetry span, log record and metric exporters for Azure.

There is a CI compilation issue with TelemetryHelper. It seems that the CI compiles this class for the OpenTelemetry exporter 1.0.0-beta.28, but also with the exporter version of the main branch. The exporter API of the main branch has changed, leading to a compilation failure. Any help to be able to fix this CI issue would be appreciated.

[alzimmermsft]

/check-enforcer override