Fix circular import TrainModelHandler <> PricecypherModel

[marijnvanderhorst]

Proposed changes

1. The pricecypher.contracts model imports both TrainModelHandler and PricecypherModel during __init__.
2. The TrainModelHandler model imports PricecypherModel form pricecypher.contracts
3. Which in turn makes the pricecypher.contracts model import the TrainModelHandler again.

Types of changes

What types of changes does your code introduce to this repository?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Testing

Unit testing

n/a

Manual testing

Use TrainModelHandler somewhere (just importing it should be enough)

Further comments

n/a

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