fix: 'flet' has no attribute BottomSheetTheme

[ndonkoHenri]

Description

Fixes #3847

Summary by Sourcery

Fix the attribute error by adding the missing import for BottomSheetTheme in the flet_core package.

Bug Fixes:

• Fix the missing import of BottomSheetTheme in the flet_core package, resolving the attribute error.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a bug where 'flet' had no attribute 'BottomSheetTheme'. The changes involve minor modifications to the Theme class in the flet-core package and an import addition in the init.py file.

File-Level Changes

Change	Details	Files
Simplified optional field declarations in the Theme class	Removed field() decorator for bottom_navigation_bar_theme Removed field() decorator for floating_action_button_theme Added icon_theme as an optional field	sdk/python/packages/flet-core/src/flet_core/theme.py
Added BottomSheetTheme to the imports in init.py	Imported BottomSheetTheme in the init.py file	sdk/python/packages/flet-core/src/flet_core/__init__.py

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[sourcery-ai]

Hey @ndonkoHenri - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[ndonkoHenri]

@FeodorFitsner, do you think we should set a default factory for all the theme-props in the Theme class?
Some props have it and some don't... (bias?)