new: orientation primitive for Solid 2.0

[davedbase]

• Adds a new orientation package (Stage 0 / Sensors) targeting Solid.js 2.0 beta.10
• makeOrientation(onChange) — non-reactive, attaches a listener for screen.orientation change events and returns a cleanup function
• createOrientation() — reactive, returns angle and type signals initialized to the current screen orientation and updated on each change; SSR-safe (returns static defaults server-side)
• Falls back to the deprecated window.orientationchange event on browsers without screen.orientation

[changeset-bot]

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