------------
**Added**
* Add official support Python 3.10;
* Add ``get_engine`` util.
**Changed**
* Argument ``target`` in signature ``bind(target ,key=SA_DEFAULT_KEY, *,
middleware=True)`` can be of the following types ``str``,
``sqlalchemy.ext.asyncio.AsyncEngine``, ``sqlalchemy.orm.sessionmaker``
or their compatible descendants. Custom session factory is no longer
supported.
**Removed**
* Removed ``views`` synonym for ``web_handlers``;
* Removed ``ItemAddMixin`` synonym for ``UnitAddMixin``;
* Removed ``ItemDeleteMixin`` synonym for ``UnitDeleteMixin``;
* Removed ``ItemEditMixin`` synonym for ``UnitEditMixin``;
* Removed ``ItemViewMixin`` synonym for ``UnitViewMixin``;
* Removed ``OffsetPagination`` synonym for ``OffsetPaginationMixin``;
* Removed ``SAItemAddMixin`` synonym for ``UnitAddMixin``;
* Removed ``SAItemDeleteMixin`` synonym for ``UnitDeleteMixin``;
* Removed ``SAItemEditMixin`` synonym for ``UnitEditMixin``;
* Removed ``SAItemViewMixin`` synonym for ``UnitViewMixin``;
* Removed ``SAListAddMixin'`` synonym for ``ListAddMixin``;
* Removed ``SAListDeleteMixin`` synonym for ``ListDeleteMixin``;
* Removed ``SAListEditMixin`` synonym for ``ListEditMixin``;
* Removed ``SAListViewMixin`` synonym for ``ListViewMixin``;
* Removed ``SAModelDeleteMixin`` synonym for ``DeleteStatementMixin``;
* Removed ``SAModelEditMixin`` synonym for ``UpdateStatementMixin``;
* Removed ``SAModelViewMixin`` synonym for ``SelectStatementMixin``;
* Removed ``SAPrimaryKeyMixin`` synonym for ``PrimaryKeyMixin``.