fix: allow keyboard toolbar take all available space

[kirillzyusko]

📜 Description

Apply arrow/done paddings on elements level, not entire container, so that conditional rendering will exclude potentially undesired paddings.

💡 Motivation and Context

Potentially "padding by default" approach may be not desired when you want your custom element (content) to place that space.

So in this PR I re-worked an approach, and if done/arrows are hidden, then content will fill entire container.

Closes #848

Successor of #851

📢 Changelog

JS

• removed paddingHorizontal from main container;
• added container for arrows and apply padding there;
• apply padding (+8px) to Done button (to compensate removed padding from main container);

🤔 How Has This Been Tested?

Tested manually on iPhone 15 Pro (iOS 17.5 Fabric).

📸 Screenshots (if appropriate):

No arrows	No done button	No toolbar elements	All elements

📝 Checklist

• CI successfully passed
• I added new mocks and corresponding unit-tests if library API was changed

[github-actions]

📊 Package size report

Current size	Target Size	Difference
169970 bytes	169908 bytes	62 bytes 📈