[FEATURE] Allow the path argument in the functions and classes databricks/sdk/service/files.py to also accept Path type

[fpgmaas]

Problem Statement

Currently, the functions in databricks/sdk/service/files.py accept only str for arguments that are paths. This can lead to confusing behavior for end-users when passing in a Path object. For example, when calling

workspace_client.files.upload(path=x, ...)

where x has type Path, users will get an error on that line;

TypeError: quote_from_bytes() expected bytes

Proposed Solution

Since the argument is called path, I think it will be common that users pass an object of type Path. Ideally, the functions take both a str or Path as input. This can be achieved by adding e.g.

    def __post_init__(self):
        self.path = str(self.path)

See also this PR. Alternatively, it would be nice if the functions would throw a clearer error, e.g. TypeError: Expected 'str' but got 'Path'.