Dash-extensions

Removed

- The `OperatorTransform` has been removed, as [similar functionality](https://dash.plotly.com/partial-properties) has been implemented in the core Dash library as part of the Dash 2.9 release

Changed

- The syntax of the `ServersideOutputTransform` has been changed. Instead of using `ServersideOutput` in place of the `Output`, one must now wrap return values in `Serverside` objects
- The `MultiplexerTransform` has been changed to simply set a flag to enable multiplexing, which has been included as part of the Dash 2.9 release (with the default being disabled)
- Add support for embedding of blueprints in function layouts
- Add `DashBlueprint` support for args/kwargs. Fixes [250](https://github.com/thedirtyfew/dash-extensions/issues/250)
- Remove `WebSocket` event handlers prior to close. Fixes [160](https://github.com/thedirtyfew/dash-extensions/issues/160)

Changed

- Add support for embedding of blueprints in function layouts

Changed

- Mitigation of 241 attempted. Race condition hard to reproduce, validity of fix is uncertain
- Addressed bugs 245 + 242
- Fixed bug 243
- Bump dependencies

Changed

- Fixed bug in html table generator

Changed

- Performance improvement of `BlockingCallbackTransform`

Changed

- Bump a number of npm packages to address security issues
- Bump `dash-mantine-components` to 0.11.0, and update code accordingly (to mitigate introduced breaking changes)