Piccolo-api

------

* Added docstrings to FastAPI endpoints in ``FastAPIWrapper``.
* Exposing count and schema endpoints in ``FastAPIWrapper``.

-------------------------------------------------------------------------------

------

* Added docs for ``__page`` and ``__page_size`` query parameters for
``PiccoloCRUD``.
* Implemented ``max_page_size`` to prevent excessive server load - courtesy
sinisaos.

-------------------------------------------------------------------------------

------

Renaming migrations which were problematic for Windows users.

-------------------------------------------------------------------------------

------

Using Pydantic to serialise the ``PiccoloCRUD.new`` response. Fixes a bug
with serialising some values, such as ``decimal.Decimal``.

-------------------------------------------------------------------------------

------

* Using Piccolo's ``run_sync`` instead of asgiref.
* Loosened dependencies.
* ``create_pydantic_model`` now supports lazy references in ``ForeignKey``
columns.
* MyPy fixes.

-------------------------------------------------------------------------------

------

* ``PiccoloCRUD`` now supports the `__readable` query parameter for detail
endpoints - i.e. `/api/movie/1/?__readable=true`. Thanks to sinisaos for
the initial prototype.
* Improving type hints.

-------------------------------------------------------------------------------