lib: remove the babylonjs and jsardom to reduce package size

[yorkie]

This pull request removes support for Babylon.js-specific bootstrap code and related framework selection logic from both the build system and runtime APIs, simplifying the codebase and focusing the runtime on more general document loading and viewing. It also cleans up unused or redundant files and interfaces, and refactors the document loading logic to streamline the handling of various content types.

[Copilot]

Pull Request Overview

This pull request removes Babylon.js-specific dependencies and JSARDOM framework code to reduce package size and simplify the codebase. The changes focus the runtime on more general document loading capabilities while removing specialized 3D rendering framework support.

Key changes:

• Removed Babylon.js package dependency and bootstrap scripts from build system
• Simplified document loading to use standard HTML instead of specialized XSML format
• Cleaned up WebXR motion controller implementations that were Babylon.js-specific

Reviewed Changes

Copilot reviewed 47 out of 50 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
webpack.config.cjs	Removed babylon bootstrap script from build configuration
src/runtime/content_manager.cpp	Removed installation of babylon bootstrap scripts
src/client/per_process.cpp	Removed babylon bootstrap script from Node.js process arguments
src/client/dom/runtime_context.cpp	Added fallback base URI handling for empty values
src/client/dom/document.cpp	Added warning messages for invalid URLs
src/client/dom/browsing_context.hpp	Enhanced document creation API with base URI parameter
src/bindings/dom/browsing_context.cpp	Updated document creation to handle base URI parameter
package.json	Removed babylonjs and @yodaos-jsar/dom dependencies, added WebXR types
lib/webxr.ts	Removed explicit XRSystem type annotations
lib/webworkers/entry.ts	Updated ResourceLoader import path
lib/runtime2/viewers/model3d.ts	Converted from XSML to standard HTML format
lib/runtime2/viewers/image2d.ts	Converted from XSML to standard HTML format
lib/runtime2/jsardom/xr/motionController/*.ts	Removed all Babylon.js-dependent WebXR motion controller files
lib/runtime2/jsardom/xr/features/*.ts	Removed all Babylon.js-dependent WebXR feature files