Added long-running-operation tool and improved comments in all tools
* Updated architecture.md
* In tools/
- add.ts
- echo.ts
- toggle-logging.ts
- toggle-subscriber-updates.ts
- Add better function and inline docs
* Added tools/long-running-operation.ts
- similar implementation as in everything v1
* In tools/index.ts
- import registerLongRunningOperationTool
- in registerTools
- registerLongRunningOperationTool
