Release 1.0.11

Implement IHost in BotApp and enhance lifecycle management

BotApp.cs:
- Implemented IHost interface in BotApp class.
- Added private field _disposed to track disposal state.
- Added CancellationTokenSource field _cancellationTokenSource.
- Updated constructor to accept a CancellationTokenSource parameter.
- Updated Run method to use a merged cancellation token.
- Added StartAsync, StopAsync, Dispose, and MergeTokens methods.
- Updated ErrorHandler, UpdateHandler, and HandleRequestAsync to call CheckDisposed.
- Added private method CheckDisposed to throw ObjectDisposedException.

BotBuilder.cs:
- Updated BotBuilder to create and pass a CancellationTokenSource to BotApp.

HostApplicationLifetime.cs:
- Updated to accept a CancellationTokenSource through its constructor.
- Removed creation of its own CancellationTokenSource.