Resolve other deprecations

[anoto-moniz]

Citrine Python PR

• Drop PEWs and PEW executions (in favor of predictor evaluations).
• Drop training_data from predictor nodes, so it only exists on the top-level graph nodes.
• Drop ResourceRef.
• Drop IngredientRatioConstraint.basis_label_names and IngredientRatioConstraint.basis_ingredient_names.
• Change EnumeratedDesignSpace.data to List[Mapping[str, str]].
• Change ChemicalFormulaFeaturizer.powers to Optional[List[float]], and deprecate ChemicalFormulaFeaturizer.powers_as_float.

Description

Please briefly explain the goal of the changes/this PR.
The reviewer should be able to understand why the change is being made by reading this description
and its links (e.g. JIRA tickets).

PR Type:

• Breaking change (fix or feature that would cause existing functionality to change)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Maintenance (non-breaking change to assist developers)

Adherence to team decisions

• I have added tests for 100% coverage
• I have written Numpy-style docstrings for every method and class.
• I have communicated the downstream consequences of the PR to others.
• I have bumped the version in __version__.py

[anoto-moniz]

After removing the PEW stuff, it turns out nothing uses ResourceRef any more.

[anoto-moniz]

PredictorEvaluation should have been included previously. Same with the similar changes below.

[kroenlein]

LGTM