fix: lazy load hls events for video textures

[raashish1601]

Summary

VideoTexture lazy-loads hls.js for HLS sources, but importing Events from hls.js at module scope still creates a runtime dependency for every consumer. This keeps both the constructor and event constants behind the dynamic import so the HLS package is only loaded when an .m3u8 source is used.

Validation

• corepack yarn typecheck
• corepack yarn eslint src/core/VideoTexture.tsx
• corepack yarn prettier --check src/core/VideoTexture.tsx
• corepack yarn build (passes with existing Rollup warnings about unused ThreeElements imports and stale Browserslist data)
• git diff --check origin/master...HEAD

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