feat(sdk): chained entity path on nested tasks

[OzBenSimhonTraceloop]

• I have added tests that cover my changes.
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• PR name follows conventional commits format: feat(instrumentation): ... or fix(instrumentation): ....
• (If applicable) I have updated the documentation accordingly.

Example

Assuming we have a workflow with three nesting levels of tasks

some_workflow 
=> outer_task 
    => inner_task
         =>  inner_inner_task

The expected entity paths will be

• some_workflow path is None
• outer_task path is 'outer_task'
• inner_task path is 'outer_task.inner_task'
• inner_inner_task path is 'outer_task.inner_task.inner_inner_task'

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[nirga]

That's a breaking change, let's wait with it for later this week as I want to release a small fix today.
Left a nit comment

[nirga]

Why did you delete this?

[OzBenSimhonTraceloop]

Actually I copied this file from Gal branch, I just saw he excluded it from his merged PR, so I'll remove this change as well 🙈