[WIP] Refactor capacity estimator routine

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Remove codegenCapacityEstimator() methods from AbstractType class and all classes that extend it. Instead implement the capacity estimator codegen in the src/codegen/capacity/ folder where a routine for each node type is a separate function, and there is one main "router" function with a big SwitchStatement which routes each node to the correct capacity estimator codegen.

Fixes #9.

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