refactor: adopt _src pattern and migrate core components
#763
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Description
This PR resolves #756 by implementing a major structural refactor. Following the design patterns of modern scientific libraries like JAX and Optax, it introduces a
pina/_srcdirectory to house internal logic while exposing a clean, flat public API.API Stability Notice
The public interface remains unchanged. Existing user scripts and external calls to PINA classes will continue to work as expected. This refactor purely reorganizes the internal source code and "hoists" definitions to their respective package levels for cleaner access.
Key Changes
pina._src.core/module.Checklist