Telemetry refactor

[cte]

Description

This makes the telemetry service more extensible.

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Important

Refactors telemetry service for extensibility, introduces RefreshTimer utility, and updates task management.

• Telemetry Refactor:
  • Introduces PostHogTelemetryClient in PostHogTelemetryClient.ts for handling telemetry events.
  • Refactors TelemetryService in TelemetryService.ts to support multiple telemetry clients.
  • Adds BaseTelemetryClient in BaseTelemetryClient.ts as an abstract class for telemetry clients.
  • Updates ClineProvider in ClineProvider.ts to implement TelemetryPropertiesProvider.
  • Modifies webviewMessageHandler.ts to handle telemetry settings updates.
• New Utility:
  • Adds RefreshTimer in refresh-timer.ts for executing callbacks with retry behavior.
  • Includes tests for RefreshTimer in refresh-timer.test.ts.
• Testing:
  • Adds tests for PostHogTelemetryClient in PostHogTelemetryClient.test.ts.
• Miscellaneous:
  • Updates extension.ts to initialize telemetry service with context.
  • Removes PostHogClient.ts as it is replaced by the new client architecture.

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