Add operation shape generation

[haydenbaker]

Description of changes:

• Adds operation shape code generation
• These will be used when we transition the client to use the python-based request pipeline
• This is a subset of changes from Add protocol implementations, operation shape generation, type registry #422

example:

GetCity = APIOperation(
    input=GetCityInput,
    output=GetCityOutput,
    schema=_SCHEMA_GET_CITY,
    input_schema=_SCHEMA_GET_CITY_INPUT,
    output_schema=_SCHEMA_GET_CITY_OUTPUT,
    error_registry=TypeRegistry(
        {
            ShapeID("example.weather#NoSuchResource"): NoSuchResource,
        }
    ),
    effective_auth_schemes=[ShapeID("smithy.api#noAuth")],
)

CI run: https://github.com/smithy-lang/smithy-python/actions/runs/13866147289/job/38805575326?pr=445

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[JordonPhillips]

Suggested change

	return createGeneratedSymbolBuilder(shape, getDefaultShapeName(shape), SHAPES_FILE)
	var name = CaseUtils.toSnakeCase(getDefaultShapeName(shape)).toUpperCase(Locale.ENGLISH);
	return createGeneratedSymbolBuilder(shape, name, SHAPES_FILE)