Piccolo-admin

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Added Python 3.12 support.

When filtering ``Varchar`` and ``Text`` columns, you can now specify the
``match``. Previously, it always defaulted to ``contains``, but now you can
specify ``starts``, ``ends`` and ``exact``. For example, you can now filter for
a movie with a name starting with ``Star Wars``.

When filtering numeric / date / time columns, you can now specify the
``not equals`` operator. For example, give me all the movie tickets which
aren't on a certain day.

Fixed some minor bugs, and added additional Playwright tests.

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Improved CSV downloads - the user now has the option of using commas or
semicolons as delimiters. In Piccolo Admin v1 we had changed to using
semicolons by default, which was causing confusion.

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The sidebar styles were improved (see
`this issue <https://github.com/piccolo-orm/piccolo_admin/issues/342>`_ for more
info).

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Fixed a regression in Piccolo Admin v1, where nullable boolean fields defaulted
to ``null`` instead of ``all`` in the filter sidebar. This was caused by
changes in Pydantic v2, where the JSON schema changed.

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Big improvements to ``Timestamptz`` columns:

* Piccolo Admin now displays the timezone in the UI.
* The resolution of the widget can be specified using ``TableConfig.time_resolution``,
so you can decide if the user can pick seconds / milliseconds.

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Updated to work with Piccolo v1 (which uses Pydantic v2).

The front end code has also been substantially upgraded to Vue v3.

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