Support for styling + RTL

Hi there,
Thanks for building this package, I have tried many and this is the best package ❤️🙏.

**Can some parameters be added?**

1. `titleStyle` useful for using custom fonts, colors, ...

_or maybe a_

2. `titleBuilder` useful for using custom text style + adding some padding (above and below see pic)
`titleBuilder` would be a `Widget Function(BuildContext context, String title)`

3. `backgroundColor` for using a custom color other than the context theme

4. `searchHint` useful for supporting other languages

5. `searchStyle` usefull for custom fonts, ...

7. `searchBackgroundColor` useful for supporting other themes (see below pic its white on dark theme)

**Other issues:**

1. RTL support, maybe need using flutter utils `Directionality.of(this)` or `AligmentDirectional`
2. Tone picker does not disappear when closing the widget

**When LTR langs:**

**When RTL langs (tone color is broken):**

**The tone picker is stuck (after closing the picker), maybe need handling in dispose:**