[feature] YAMLDataLoader and YAMLDataSaver as default data adapters

[wmoreiraa]

Adding the option to do I/O using YAML files, similar as what we have with json.

Changes

Adding YAML as default data adapter

How I tested this

Same test module as others default data adapters, 3 unit tests:

1. Isolated load
2. Isolated save
3. Using both loader and saver.

Notes

Followed pattern of json, but expanded the options of applicable_types

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

Looks good!

One request: we should move this to the plugins folder. We don't have yaml as a core dependency, and I don't want to add it.

So we should move this to a file like:

hamilton/plugins/yaml_extensions.py

At the top it should have some code like:

try:
    import yaml
except ImportError:
    raise NotImplementedError("yaml is not installed.")

Then at the bottom it should have some additional code like:

from hamilton import registry

COLUMN_FRIENDLY_DF_TYPE = False

def register_data_adapters():
    """Function to register the data loaders for this extension."""
    for loader in [
        YAMLDataLoader,
        YAMLDataSaver
    ]:
        registry.register_adapter(loader)


register_data_adapters()

and then in hamilton/function_modifiers/base.py add yaml to plugins_modules list so that we try to import it.

[wmoreiraa]

thanks for the review @skrawcz and totally agree! Nice to learn how the plugins works too :)

[wmoreiraa]

Fixed back the PrimitiveType issue. @skrawcz lemme know if something still missing

[skrawcz]

Thanks @wmoreiraa !