SDK - Components - Added the ComponentSpec.save method

[Ark-kun]

This change is 

[numerology]

I think it would be better if a unittest is added.

[Ark-kun]

I think it would be better if a unittest is added.

I think this code path is tested by the following unit tests:

pipelines/sdk/python/tests/components/test_python_op.py

Line 166 in be4f585

def test_func_to_container_op_output_component_file(self):

pipelines/sdk/python/tests/components/test_python_op.py

Line 175 in be4f585

def test_func_to_component_file(self):

pipelines/sdk/python/tests/components/test_python_op.py

Line 730 in be4f585

def test_end_to_end_python_component_pipeline_compilation(self):

This PR just extracts/moves the code.

[numerology]

/lgtm

[Ark-kun]

/approve

[k8s-ci-robot]

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