Exporter options for base module

[harsimar]

This adds some public apis to configure AzureMonitorExporterOptions from @Microsoft.ApplicationInsights 3.x

See issue

[Copilot]

Pull request overview

This PR adds public APIs to the TelemetryConfiguration class to configure Azure Monitor exporter options for ApplicationInsights 3.x. These methods provide a user-friendly way to configure sampling, storage, live metrics, and trace-based log sampling settings.

• Adds six new public configuration methods to TelemetryConfiguration
• Provides comprehensive test coverage with 350 lines of unit tests
• Updates the public API surface documentation

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
BASE/src/Microsoft.ApplicationInsights/Extensibility/TelemetryConfiguration.cs	Adds six new public methods (SetSamplingRatio, SetTracesPerSecond, SetStorageDirectory, DisableOfflineStorage, DisableLiveMetrics, DisableTraceBasedLogsSampling) to configure AzureMonitorExporterOptions
BASE/Test/Microsoft.ApplicationInsights.Test/Microsoft.ApplicationInsights.Tests/TelemetryConfigurationSetExporterOptionsTests.cs	Comprehensive test suite with 18 test methods covering all new configuration methods, including validation, error handling, and chaining scenarios
.publicApi/Microsoft.ApplicationInsights.dll/Stable/PublicAPI.Unshipped.txt	Documents the six new public APIs for API compatibility tracking

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