[TSK-15] - Bug Fixes and Enhancements

[phrp720]

This pull request includes several changes to improve error handling, update documentation, and enhance functionality in the aw-sync-agent project. The most important changes include renaming the system_error package to errors, modifying the checkpoint package to store timestamps as strings, and adding a unique ID to events in the datamanager package.

Error handling improvements:

• Renamed system_error package to errors and updated all references accordingly. [1] [2] [3]
• Enhanced error messages to provide more context. [1] [2]

Documentation updates:

• Removed the roadmap section from the main README.md file.
• Updated the package structure in the agent's README.md to reflect the renaming of the system_error package to errors.

Functionality enhancements:

• Modified the checkpoint package to store timestamps as strings for better compatibility and parsing. [1] [2]
• Added a unique ID to events in the datamanager package to avoid duplicate errors.
• Filtered out events with the same timestamp as the start point in the aw/client.go file.

Codebase simplification:

• Commented out the settings in the aw-sync-agent.yaml file to provide a cleaner configuration template.
• Added the net/url package import for URL encoding in aw/client.go.