feat(type-safe-api): faster code generation for python runtime

[cogwirrel]

Move python runtime project to new codegen.

Includes a few generic adjustments to the generator too:

• Add mockData to properties in the codegen data for use as example values in the python runtime markdown docs
• Support for ejs include to reference other partial templates
• Ensure the link property is set for array/dictionary models and properties so that templates can reference child items

Note that I put the logic to generate the pydantic type in a template rather than as part of the generator, since pydantic feels too implementation specific to live in the generator data.

[nx-cloud]

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