feat(core): update plugin with generic polling support and monorepo structure

- Update package.json with workspaces configuration for monorepo structure
- Add test:workspaces script for running tests across all packages
- Update src/definitions.ts with enhanced type definitions for generic polling
- Improve src/callback-registry.ts with better error handling and logging
- Enhance src/observability.ts with telemetry budgets and PII redaction
- Update src/typescript/SecurityManager.ts with JWT validation improvements
- Add support for @timesafari/polling-contracts package integration
- Include backward compatibility with existing plugin interfaces
- Improve TypeScript type safety across all core modules
- Add comprehensive error handling and logging throughout

Establishes the foundation for generic polling while maintaining existing functionality.

src/observability.ts

@@ -178,7 +178,7 @@ export class ObservabilityManager {
   /**
    * Get recent event logs
    */
-  getRecentLogs(limit: number = 50): EventLog[] {
+  getRecentLogs(limit = 50): EventLog[] {
     return this.eventLogs.slice(0, limit);
   }