feat: add telemetry export support with multiple backends

[kashishhora]

Summary

Adds support for telemetry exporters to enable sending MCP analytics to existing observability infrastructure. Users can now export events to OpenTelemetry collectors, Datadog, or Sentry.

Key Features

• Telemetry-only mode: Pass null as projectId to use only telemetry exporters without MCPCat account
• Dual mode: Send events to both MCPCat and telemetry exporters simultaneously
• Multiple exporters: Configure multiple exporters to send data to different systems

Supported Exporters

• OTLP: OpenTelemetry Protocol for standard observability tools
• Datadog: Logs and metrics with proper tagging
• Sentry: Performance monitoring and error tracking

Example

track(mcp, project_id=project_id, options={
  exporters: {
    otlp: {
      type: "otlp",
      endpoint: "http://localhost:4318/v1/traces"
    }
})