Implement Double Jump and Glide

## Description Implement double jump and glide mechanics for player movement in bevy-explorer. ## Context This feature is part of the upcoming player movement improvements planned for Dec/Feb. The double jump allows players to jump a second time while in the air, and the glide mechanic provides controlled descent. ## Reference Implementation This feature has been implemented in unity-explorer. See related issues: - https://github.com/decentraland/unity-explorer/issues/7273 - https://github.com/decentraland/unity-explorer/issues/7274 - https://github.com/decentraland/unity-explorer/issues/7270 - https://github.com/decentraland/unity-explorer/issues/7031 - https://github.com/decentraland/unity-explorer/issues/7272 ## Additional Context - Notion spec: https://www.notion.so/decentraland/Double-Jump-and-Glide-2b75f41146a5804dbff5c769a9a60810 - Related unity-explorer repository: https://github.com/decentraland/unity-explorer ## Source Created from Slack thread discussion on 2026-02-26