docs: Comprehensive documentation update for task queue system

Expanded documentation with detailed sections on:
- Persistence and storage adapters
- Job lifecycle management
- Workflow composition
- Steps and checkpointing
- Execution policies
- Inter-job communication
- Observability and monitoring
- Deployment considerations
- Example workflow patterns

Added in-depth explanations of core concepts, API usage, and best practices to provide a more comprehensive guide for developers.

Author: Sheraff