Added UTF-8 encoding to writers for cross-OS compatibility

[JensWendt]

As I am mainly using Windows I ran into issues with special characters like µ in Key-Value pairs and üäöß (german special characters) in names of images/datasets.
The error was:

INFO:omero_cli_transfer:Unzipping .\image.tar...
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\miniforge\envs\omero-cli-transfer\Scripts\omero.exe\__main__.py", line 5, in <module>
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero\main.py", line 125, in main
    rv = omero.cli.argv()
         ^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero\cli.py", line 1771, in argv
    cli.invoke(args[1:])
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero\cli.py", line 1208, in invoke
    stop = self.onecmd(line, previous_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero\cli.py", line 1285, in onecmd
    self.execute(line, previous_args)
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero\cli.py", line 1367, in execute
    args.func(args)
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero_cli_transfer.py", line 200, in _wrapper
    return func(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero_cli_transfer.py", line 325, in unpack
    self.__unpack(args)
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero_cli_transfer.py", line 618, in __unpack
    hash, ome, folder = self._load_from_pack(args.filepath,
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\omero_cli_transfer.py", line 672, in _load_from_pack
    ome = from_xml(posixpath.join(folder, "transfer.xml"))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\ome_types\_conversion.py", line 121, in from_xml
    xml_2016 = ensure_2016(
               ^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\site-packages\ome_types\_conversion.py", line 479, in ensure_2016
    return ET.parse(normed_source)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\miniforge\envs\omero-cli-transfer\Lib\xml\etree\ElementTree.py", line 1219, in parse
    tree.parse(source, parser)
  File "c:\miniforge\envs\omero-cli-transfer\Lib\xml\etree\ElementTree.py", line 581, in parse
    self._root = parser._parse_whole(source)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 30, column 33

Setting the encoding to UTF-8 for the writing should alleviate this.
I also set newline='' for the csv.writer as AI was pointing me towards it (https://docs.python.org/3/library/csv.html the footnote at the bottom) as an additional safety net

[erickmartins]

Thanks, Jens! This looks pretty straightforward (and useful) so I'll try to find a minute this week to review it properly.