vine: include functions and classes in hoisting_modules

[JinZhou5042]

Proposed Changes

This PR is in part to support #3892 to run on a serverless mode. It essentially does two things:

1. Rename the import_modules to hoisting_modules to expand it's definition, so as to accept not only python packages, but also classes and functions

2. Accept class and function declarations and hoist in the library code. For example:

import uuid
import random

class test_class():
    def __init__(self):
        print("test")

def test_func():
    return 100

libtask = engine.executor.create_library_from_functions(
    "test-library", noop_task, hoisting_modules=[uuid, random, test_class, test_func], add_env=False
)

This will hoist the declarations of test_class and test_func so that function calls can invoke directly.

Merge Checklist

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Check these off to verify you have completed all steps.

• make test Run local tests prior to pushing.
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• make lint Run lint on source code prior to pushing.
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[JinZhou5042]

RTM