Unpack dictionary parameters

Description

In response to this ticket

Development notes

Can now unpack dictionaries in the inputs argument of a node, example below.

_unpack_params added to kedro/kedro/pipeline/node.py, this function iterates over node inputs and updates node.inputs if needed.

note: It is assumed that the dictionary entries and kwarg have the same name

Changes:

kedro/kedro/pipeline/modular_pipeline.py was updated to not throw errors when mapping dataset names. _is_single_parameter returns true if name starts with **params: _normalize_param_name does not append params: if the name already begins with **params: _validate_datasets_exist removes datasets that begin with ** from non_existent, I have confirmed that kedro/runner/runner.py will catch these missing datasets.

Undesirable behavior

~~Currently modular pipelines will still namespace the unpacked parameters, I'll need assistance with either updating the rules list or adjusting the rename function in a way that makes sense.~~

EDIT: This is no longer applicable after commit

Examples:

nodes.py

def split_data(data: pd.DataFrame, features: List[str], test_size, random_state) -> Tuple:
    X = data[features]
    y = data["price"]
    X_train, X_test, y_train, y_test = train_test_split(
        X, y, test_size=test_size, random_state=random_state
    )
    return X_train, X_test, y_train, y_test

pipeline.py

node(
    func=split_data,
    inputs=["model_input_table", "**params:model_options"],
    outputs=["X_train", "X_test", "y_train", "y_test"],
    name="split_data_node",
),

model_options:
  test_size: 0.2
  random_state: 3
  features:
    - engines
    - passenger_capacity
    - crew
    - d_check_complete
    - moon_clearance_complete
    - iata_approved
    - company_rating
    - review_scores_rating

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Checklist

[X] Read the contributing guidelines
[X] Signed off each commit with a Developer Certificate of Origin (DCO)
[ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
[X] Updated the documentation to reflect the code changes
[X] Added a description of this change in the RELEASE.md file
[X] Added tests to cover my changes
[X] Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

kedro-org / kedro