[BUG] pyflyte run cannot handle imperative workflows

[iaroslav-ciupin]

Describe the bug

This docs page https://docs.flyte.org/projects/cookbook/en/latest/auto/core/flyte_basics/imperative_wf_style.html suggests to run imperative flow example like so:
pyflyte run --remote imperative_wf_style.py wf --in1 hello --in2 foo

but it fails with

Traceback (most recent call last):
  File "/opt/homebrew/bin/pyflyte", line 8, in <module>
    sys.exit(main())
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/flytekit/clis/sdk_in_container/run.py", line 516, in _run
    remote_entity = remote.register_script(
  File "/opt/homebrew/lib/python3.9/site-packages/flytekit/remote/remote.py", line 596, in register_script
    upload_location, md5_bytes = fast_register_single_script(
  File "/opt/homebrew/lib/python3.9/site-packages/flytekit/tools/script_mode.py", line 105, in fast_register_single_script
    _, mod_name, _, script_full_path = extract_task_module(wf_entity)
  File "/opt/homebrew/lib/python3.9/site-packages/flytekit/core/tracker.py", line 237, in extract_task_module
    name = f.__name__.split(".")[-1]
AttributeError: 'ImperativeWorkflow' object has no attribute '__name__'

Expected behavior

example should successfully run

Additional context to reproduce

No response

Screenshots

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

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