Swan-sdk

* Minor fix
* Update docs
* Update examples

What's Changed
- Reworked Swan SDK APIs.
- Added verification when login.
- Separate task deployment into task creation and payment confirmation.
- Moved source URI generation to backend.
- Removed manual source uri generation options.
- Removed MCS dependency.

Support SDK access to Swan Hub APIs
- Create/prepare task.
- Retrieve computing provider machine/hardware information.
- Generate job source URI for task.
- GitHub repository support.
- Lagrange space support.
- Retrive task info.
- Payment with Swan Token through Swan payment contract.
- Deploy task to computing provider.
- Retrieve deployed space task result and deployed ports.