Prepare Flet 0.27.0

[FeodorFitsner]

Summary by Sourcery

Prepares Flet for the 0.27.0 release by adding new UI controls, enhancing existing components, fixing bugs, updating the build process, and removing deprecated features.

New Features:

• Introduces the DropdownMenu control.
• Implements the ReorderableListView control.
• Adds the flet doctor CLI command.
• Implements button themes for ElevatedButton, OutlinedButton, TextButton, FilledButton, and IconButton.

Bug Fixes:

• Fixes an issue where setting SearchBar.bar_border_side was not visually honored.
• Fixes an issue where long dropdown options caused the down-arrow to overflow.
• Fixes an issue where CupertinoSlider initialization did not allow values less than zero or greater than one.
• Fixes an issue where the same code showed different appearances in Flet APP/Web/PC local.
• Fixes an issue where transforming scale rendered a grey screen.
• Fixes a UnicodeDecodeError when using accented characters in manifest.json.
• Implements SearchBar.blur() to programmatically unfocus the bar.

Enhancements:

• Implements the Container.dark_theme property.
• Upgrades to Pyodide 0.27 for httpx support.
• Removes CupertinoCheckbox.inactive_color in favor of fill_color.
• ControlEvent.data is now of type Optional[str] and defaults to None.

Build:

• flet build now uses a Provisioning Profile to sign iOS app archives (.ipa) and deprecates the --team option.
• flet build now includes --source-packages to allow installing certain Python packages from source distros.

Chores:

• Removes v0.24.0 deprecations.
• Disables markup for flet-cli stdout logs.