[NXDRIVE-2467] Use union types for better readability - Nuxeo Issue Tracker

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Use union types to improve readability of the whole project. See the PEP 604 for details.

Short summary: we can rewrite Union and Optional.

Before:

def f(list: List[Union[int, str]], param: Optional[int]) -> Union[float, str]

After:

def f(list: List[int | str], param: int | None) -> float | str:

is related to

NXDRIVE-1242 Use type annotations everywhere