Redesign Inputs API

[ovidiuch]

• Create discussion to explain change and ask for feedback UI controls API improvements #1620

Implementation

• Add useCosmosInput alias. Add useInput API with backwards compatible useValue alias.
• Add useCosmosSelect alias.
• Rename controls to inputs in fixture state and Cosmos UI plugins.

Update docs

• Use new API methods in examples.
• Rename "UI Controls" to "Inputs" in docs.
• Separate Viewport from Inputs docs.
• Mention support for useSelect option groups in docs.

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