feat: BehaviorSticky sharing isSticky state

[aarronte86]

BehaviorSticky

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TASK: PI-70051

Description, Motivation and Context

This feature adds the capability of sharing the isSticky current state, providing a high degree of flexibility. It is particularly useful when we need to render different variants of the component given to BehaviorSticky as children, depending on whether the current position is sticky or not.

Types of changes

• [ ] 🪲 Bug fix (non-breaking change which fixes an issue)
• [x] ✨ New feature (non-breaking change which adds functionality)
• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] 🧾 Documentation
• [x] 📷 Demo
• [ ] 🧪 Test
• [ ] 🧠 Refactor
• [ ] 💄 Styles
• [ ] 🛠️ Tool

[github-actions[bot]]

	STATEMENTS	BRANCHES	FUNCTIONS	LINES
≍	≍ 0.01↑	≍ 0.03↑	≍ 0.04↑	≍ 0.04↑
%	75.98	64.4	65.99	77.74
ABS	3341 / 4397	2046 / 3177	654 / 991	3162 / 4067