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Integrating Patrick's SimpleCodegenTask base class with WireGen.

Refactors of other codegen classes omitted in this patch for
simplicity; I will circle back and add Jaxb and Protobufs in a
new review once this patch goes through.

There are some TODO's for integrating isolated code-generation
strategies (the real motivation behind simplifying codegen),
which I will also circle back and replace with real code after
landing this patch.

Testing Done:
test tests/python/pants_test/backend/codegen/tasks:wire_gen passes,
test tests/python/pants_test/tasks:wire_integration passes,
CI is green.

I updated the wire test-cases a bit, including adding a unit test for sources_generated_by_target. I also added another .proto to the wire/elements example, and updated the corresponding integration test, to insure codegen works properly with multiple .proto files in the same target.

Bugs closed: 1597

Reviewed at https://rbcommons.com/s/twitter/r/2274/

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13582 of 19587 relevant lines covered (69.34%)

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