fix: export MCPAgentExecutionEventData as type export

Interfaces are compile-time only and cannot be exported as runtime values.
Using 'export type' prevents module resolution errors when running examples with tsx.

Author: pietrozullo

packages/mcp-use/src/telemetry/index.ts

@@ -1,6 +1,7 @@
 import { Telemetry } from './telemetry.js'
 
-export { BaseTelemetryEvent, MCPAgentExecutionEvent, MCPAgentExecutionEventData } from './events.js'
+export { BaseTelemetryEvent, MCPAgentExecutionEvent } from './events.js'
+export type { MCPAgentExecutionEventData } from './events.js'
 export { Telemetry } from './telemetry.js'
 export { extractModelInfo, getModelName, getModelProvider, getPackageVersion } from './utils.js'