fix: Typing mismatch in filesystem write method

[sharat87]

The function signature here is:

    def write(
        self,
        path_or_files: Union[str, List[WriteEntry]],
        data_or_user: Union[str, bytes, IO, Username] = "user",
        user_or_request_timeout: Optional[Union[float, Username]] = None,
        request_timeout_or_none: Optional[float] = None,
    ) -> Union[EntryInfo, List[EntryInfo]]:

Notice that path_or_files is str or a list of WriteEntry objects. But further down, if it is a str, we're turning it into a list of dicts, instead of into a list of WriteEntry objects. We also then proceed to use it like a dict. But this means if we pass a list[WriteEntry], as the type hint suggests, we get the following error:

  File ".../spike.py", line 49, in write_files
    box.files.write(
          ~~~~~~~~~~~~~~~^
        [
        ^
    ...<2 lines>...
        ],
        ^^
    )
    ^
  File ".../.venv/lib/python3.13/site-packages/e2b/sandbox_sync/filesystem/filesystem.py", line 213, in write
    file_path, file_data = file["path"], file["data"]
                           ~~~~^^^^^^^^
TypeError: 'WriteEntry' object is not subscriptable

This PR fixes this, by instead only creating/assuming WriteEntry objects in the list, as the type hint suggests.

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[sharat87]

Note that this would mean we break backwards compatibility here. I can edit the fix to allow dicts to be passed in as well, if needed. Let me know.

[mishushakov]

I think type WriteEntry is incorrect here. According to the docs is should be a (typed) dict:
https://e2b.dev/docs/filesystem/read-write#writing-multiple-files

If you can fix that incorrect type, we can proceed.

[ValentaTomas]

One note here—this will probably also be in the async Python implementation.