textual 2.0.0 support

Hi! In [nixpkgs](https://github.com/NixOS/nixpkgs) we try to use the latest python packages, and noticed some changes need to be done to this project in order to work with [textual 2.0.0](https://github.com/Textualize/textual/releases/tag/v2.0.0): - [NewOptionListContent](https://github.com/tconbeer/textual-textarea/blob/ab25de3531e0a00062ea8bb40f595be382a9481b/src/textual_textarea/autocomplete.py#L74) needs to be changed to `OptionListContent` (changed in https://github.com/Textualize/textual/commit/1cfd33c76e084bf1efadf2feaf932a071fffd462) - [items](https://github.com/tconbeer/textual-textarea/blob/ab25de3531e0a00062ea8bb40f595be382a9481b/src/textual_textarea/autocomplete.py#L190) got renamed to `new_options` (changed in https://github.com/Textualize/textual/commit/1cfd33c76e084bf1efadf2feaf932a071fffd462) - > Breaking change: Removed wrap argument from OptionList (use CSS text-wrap: nowrap; text-overflow: ellipses) https://github.com/tconbeer/textual-textarea/blob/ab25de3531e0a00062ea8bb40f595be382a9481b/src/textual_textarea/autocomplete.py#L81 - fix newly failing test <details><summary>test result</summary> ```console FAILED tests/functional_tests/test_textarea.py::test_keys[keys2-select\n foo-selection2-select\n foo-expected_selection2] - AssertionError: assert Selection(start=(0, 6), end=(0, 6)) == Selection(start=(1, 0), end=(1, 0)) Differing attributes: ['start', 'end'] Drill down into differing attribute start: start: (0, 6) != (1, 0) At index 0 diff: 0 != 1 Full diff: ( - 1, 0, + 6, ) Drill down into differing attribute end: end: (0, 6) != (1, 0) At index 0 diff: 0 != 1 Full diff: ( - 1, 0, + 6, ) Full diff: - Selection(start=(1, 0), end=(1, 0)) ? ^ ^ ^ ^ + Selection(start=(0, 6), end=(0, 6)) ? ^ ^ ^ ^ ``` </details> - possibly others