chore: add logging to TaskManager

[kabir]

Description

I noticed while reviewing #181 and looking at the Python implementation that we don't have logging in the TaskManager. We decided on the logging strategy after the initial code was written. This PR addresses this omission.

[gemini-code-assist]

Summary of Changes

Hello @kabir, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a previously identified omission by integrating logging capabilities into the TaskManager class. The changes introduce SLF4J-based logging to provide clearer insights into artifact management processes and to flag potential issues, aligning the TaskManager with the project's established logging strategy.

Highlights

• Logging Integration: Integrated SLF4J logging into the TaskManager class to provide better visibility into task management operations, aligning with the project's established logging strategy.
• Artifact Management Visibility: Added debug logs within the saveTaskEvent method to trace operations such as replacing, adding, and appending parts to artifacts.
• Error/Warning Logging: Introduced a warning log to alert when an attempt is made to append to a non-existent artifact, which helps in identifying and debugging potential data inconsistencies.

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[gemini-code-assist]

Code Review

This pull request adds valuable logging to the TaskManager, which will greatly improve traceability and debugging. The implementation is solid, using SLF4J with parameterized messages. I've left a couple of minor suggestions to clean up an unused import and fix a typo in a log message. Overall, great work!

[sunyuhan1998]

LGTM!