Table and model update logic

[kroenlein]

Citrine Python PR

Description

This PR adds a private method to table_config to migrate a TableConfig to a multistep materials table, and a private method to graph_predictor to migrate a GraphPredictor to one that includes AttributeAccumulationPredictors.

https://citrine.atlassian.net/browse/PNE-731

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