Summary of Changes

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This pull request undertakes a significant refactoring effort to remove the majority of "semantics" plugin objects from the Python rules. These objects were initially introduced to facilitate extensions for an internal Google implementation but are no longer serving their original purpose effectively. The py_library rule has been completely decoupled from this semantics system, and the py_binary rule has seen its semantics substantially streamlined, retaining only specific hooks for debugging, build data, and C++ dependencies. The overall goal is to simplify the codebase by removing an obsolete abstraction layer.

Highlights

• Complete Removal of py_library Semantics: The LibrarySemantics struct and all associated logic have been entirely eliminated, simplifying the implementation of the py_library rule by removing an unnecessary abstraction layer.
• Streamlined py_binary Semantics: The BinarySemantics struct has been significantly reduced in scope, with many parameters and functions removed. It now retains only essential hooks for debugger support, build data generation, and C++ dependencies.
• Direct Function Calls: Functions previously accessed through the semantics object, such as get_imports, maybe_precompile, and is_stamping_enabled, are now called directly. This change reduces indirection and simplifies the codebase.

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