Updates for Dash 3.0

[AnnMarieW]

Replacement for PR 499.
Please see #499 for more details and sample apps

Closes #453

This PR replaces #458 which only handled changes for Dash 3. This PR includes updates for Dash 3 that are also compatible with Dash 2.

• handle removal of loading_state
• handle deprecation of defaultProps, including new way of setting persistence props
• handle removal of _dashprivate_loadingState used in the Skeleton component.
• update Checkbox component which has an icon component prop that needs to be rerender with additional props.
• update all components that used _dashprivate_layout: Checkbox, Popover, Menu, Hovercard, Timeline, Stepper
• Check PR # 458 to make sure all changes are applied here too.
• In package.json, pin "dash-extensions-js": "0.0.8" . Before upgrading, check for Dash 2 compatibility. This package is required for the renderDashComponent function, which may be affected by updates in future Dash versions.
• Require dash >= 3.0 for install -- temporary change to run tests using dash 3. Reverted for pre-release.
• Set up tests to run for dash 2 and dash 3

Note - do not use the new typing support because it does not handle Mantine typing correctly.

ignore this comment in the build and add notes to releasing.md to ensure it's not added in the future

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! Missing proptypes.js in dash_mantine_components/__init__.py !
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Add the following to dash_mantine_components/__init__.py to enable
runtime prop types validation with tsx components:

[alexcjohnson]

💃 Looks great. I'll note that there are a couple of places (Checkbox and a couple of charts are the ones I noticed) where you omitted a default value of false that was previously explicit. This shouldn't change the behavior at all, it'll just change the docstring, but to my eye leaving these implicit is intuitive.