union with builtin variant name bug

[afloren-palantir]

Before this PR

the following properties are generated on the union class:

@builtins.property
def float(self) -> Optional[float]:
    return self._float

@builtins.property
def double(self) -> Optional[float]:
    return self._double

however a type error occurs when evaluating the return type of the double method where the float type is interpreted as the class' property, i.e., the following error is thrown on import:

_______________ ERROR collecting test/client/test_import_all.py ________________
test/client/test_import_all.py:1: in <module>
    from generated_integration import *
test/generated_integration/generated_integration_subpackage/__init__.py:2: in <module>
    from .._impl import (
test/generated_integration/_impl.py:1025: in <module>
    class product_UnionWithBuiltinVariantName(ConjureUnionType):
test/generated_integration/_impl.py:1069: in product_UnionWithBuiltinVariantName
    def double(self) -> Optional[float]:
../../../.pyenv/versions/3.8.12/lib/python3.8/typing.py:261: in inner
    return func(*args, **kwds)
../../../.pyenv/versions/3.8.12/lib/python3.8/typing.py:364: in __getitem__
    arg = _type_check(parameters, "Optional[t] requires a single type.")
../../../.pyenv/versions/3.8.12/lib/python3.8/typing.py:149: in _type_check
    raise TypeError(f"{msg} Got {arg!r:.100}.")
E   TypeError: Optional[t] requires a single type. Got <property object at 0x7fa26ff448b0>.

After this PR

float fields/variants are sanitized and the new test case (and all existing test cases) pass

==COMMIT_MSG==
==COMMIT_MSG==

Possible downsides?

Technically this is a break for clients who were accessing fields/variants with the name "float" (notably this behavior was already the case for str, bool, int and other builtin types) but since those clients would have been broken we don't expect this to actually be an issue for any consumers.

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Description

union with builtin variant name bug

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[afloren-palantir]

since sanitizing would be a client break we are working around with #749