feat: add db update function in py sdk

[Undertone0809]

Pull Request

Description

• Add TaskDB update statement of Step, Task and Artifact for python sdk.
• Add update functions implementation for InMemoryTaskDB.
• Fix: When we run execute_agent_task_step, step need to be updated in DB.

Checklist

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• [x] My code adheres to the project's coding standards and style guidelines.

• [x] I have tested my changes thoroughly, including unit tests where applicable.

• [ ] I have updated the documentation to reflect any changes made in this pull request.

• [x] My branch is up-to-date with the latest changes from the main branch.

• [ ] I have received code review feedback and addressed any comments or concerns.

Additional Notes

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References, Fixes and Closes

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• References #related_issue_number
• Fixes #related_issue_number
• Closes #related_issue_number