Piccolo-admin

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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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The default rate limiting is now more aggressive. This can be overridden using
the ``rate_limit_provider`` argument of ``create_admin``.

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Improved the handling of nullable ``Varchar`` / ``Text`` columns in the UI.

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Improved the handling of nullable ``JSON`` / ``JSONB`` columns in the UI.

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