Implement Physics Impulses to Player

## Description Implement physics impulses that can be applied to the player character, allowing external forces to affect player movement. ## Context This feature is part of the upcoming player movement improvements planned for Dec/Feb. Physics impulses enable game elements to apply forces to the player (e.g., jump pads, wind zones, explosions). ## Reference Implementation This feature has been implemented in unity-explorer. See related issues: - Epic: https://github.com/decentraland/unity-explorer/issues/7262 - https://github.com/decentraland/unity-explorer/issues/7264 (multiplayer considerations) - https://github.com/decentraland/unity-explorer/issues/7263 (animation handling) ## Additional Context - Notion spec: https://www.notion.so/decentraland/Physics-Impulses-to-Player-2b75f41146a58005951bff899f0df193 - Related unity-explorer repository: https://github.com/decentraland/unity-explorer ## Source Created from Slack thread discussion on 2026-02-26