:lipstick: migrate `DebugFloatingThemeButton` to Material 3

[Pavel-Sulimau]

Description of the Change

• DebugFloatingThemeButton button was still in Material 2 design because internally it used ToggleButtons. SegmentedButton is a Material 3 version of ToggleButtons, so it was used instead.
• Set debugShowFloatingThemeButton to true in the example app.
• Added Padding to the content of the HomePage in the example app to make the text better looking.

Before	After

Benefits

More consistency in the package as the migration to Material 3 of the example app was done in version 3.4.1

Possible Drawbacks

I don't see any.

Verification Process

• Made sure the tests were updated and all of them passed.
• Tested the DebugFloatingThemeButton in the example app.

Applicable Issues

None.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e835f1d) 94.38% compared to head (af6268c) 94.40%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #55 +/- ## ========================================== + Coverage 94.38% 94.40% +0.01% ========================================== Files 7 7 Lines 303 304 +1 ========================================== + Hits 286 287 +1 Misses 17 17 ```

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[BirjuVachhani]

@Pavel-Sulimau Thank you for your contribution! 🎉