#4673 [Core feature] Eager should support executing tasks/workflows by reference without having access to the original function Issue created by pryce-turner ### Motivation: Why do you think this is important? This feature would streamline the workflow development process by enabling local execution of a workflow while tasks are in fact being run in a flyte cluster with access to GPUs, agents, plugins etc. ### Goal: What should the final outcome look like, ideally? This feature should enable something like the following:

from flytekit.experimental import eager
from flytekit.types.directory import FlyteDirectory
from flytekit.remote.remote import Config, FlyteRemote

remote = FlyteRemote(
  config=Config.auto(config_file="config.yaml"),
  default_project="project_name",
  default_domain="development",
  )

remote_workflow = remote.fetch_launch_plan(
  project="project_name", name="workflow_name", version="version_number"
  )

@eager(remote=remote)
async def toy_example(directories: FlyteDirectory) -> bool:
  result = await remote_workflow(directories=[directories])
  return 0

More concisely, a new class e.g.

import_launchplan

could be used inside of the eager workflow and inherit it's remote definition to fetch things:

result = await import_launchplan('lp_name')(directories=[directories])

And be executable with:

pyflyte --config config.yaml run --project project_name toy_example.py toy_example --directories ./

which currently return:

Remotely fetched entities cannot be run locally. Please mock the workflows.remote_workflow.execute.

### Describe alternatives you've considered It's possible to use

pyflyte run --remote

followed by

pyflyte fetch

to get the assets back locally, but that's a more manual process. It would also be possible to define everything in a remote context within a python script, including the fetch, but that's developing further away from production. ### Propose: Link/Inline OR Additional context Could be related to: #4570 ### Are you sure this issue hasn't been raised already? • Yes ### Have you read the Code of Conduct? • Yes flyteorg/flyte