fixed len_output method does not support handler-defined logic issue

[koussayinsat12]

This pull request refactors the len_output method in the workflow implementation to address inconsistencies in how output lengths are calculated. Previously, the method directly computed the length of self.current_output, ignoring handler-defined logic. This caused issues when custom handlers redefined the logic for determining output length.

The updated implementation now leverages the corresponding handler to calculate the length of the output, ensuring consistency across workflows.

Key Changes:

1.Delegation to Handlers:

• The method now retrieves the appropriate handler using self.workflow.handlers and delegates the length calculation to handler.len_output(output).

2.Flexible Output Selection:

• Added an output parameter (default: -1) to specify which output to evaluate, making the method more versatile for workflows with multiple outputs.

3.Improved Readability and Maintenance:

• Introduced type hints (int | None) and a detailed docstring for better code clarity and usability.

[zeddo123]

Thank you @koussayinsat12 for your contribution! There's a single think to take care of and then we'll merge this PR.

[zeddo123]

LGTM! Thanks @koussayinsat12