Piccolo

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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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Namespaced all custom values we added to Pydantic's JSON schema for easier
maintenance.

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All of the changes from 0.120.0 merged into the v1 branch.

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Initial alpha release of Piccolo v1, with Pydantic v2 support.

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