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Add Action Mapping system for rebindable input controls

Implements Issue #414: Action Mapping system in KeenEyes.Input.Abstractions.

New types:
- InputBindingType: Enum for binding source types (Key, MouseButton, etc.)
- InputBinding: Struct representing a single input source with factory methods
- InputAction: Named action with multiple bindings and state queries
- InputActionMap: Collection of related actions for context switching
- IActionMapProvider/ActionMapProvider: Manager for multiple action maps

Features:
- Multiple bindings per action (keyboard + gamepad fallback)
- Runtime rebinding support for player customization
- Axis-as-button conversion with configurable threshold
- Per-player gamepad binding via GamepadIndex property
- Context-based action maps (e.g., "Gameplay" vs "Menu")

Also includes:
- 93 unit tests in KeenEyes.Input.Abstractions.Tests
- Sample demonstration in Sample.Input
- Comprehensive documentation in docs/input.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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