fix: include the source in the packages

[aminya]

This has several benefits:

• Allows directly importing the source files, that could resolve the issues with server-side rendering with various build systems
• Can result in more optimized code as the source file is directly built by the build tool (better tree shaking or more modern syntax)
• Compatibility with new package registries such as JSR that prefer TypeScript over JavaScript
• In security conscious environments, the source files can be checked against GitHub and then used directly.

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[jer3m01]

I'm not super familiar with source exports, but for @kobalte/core would this be more optimized to avoid barrel files (which will be removed at some point) in favor of separated exports:

"exports": {
    ".": {
      "types": "./dist/index.d.ts",
      "solid": "./dist/index.jsx",
      "default": "./dist/index.js"
    },
    "./*": {
      "types": "./dist/*/index.d.ts",
      "solid": "./dist/*/index.jsx",
+     "source": "./src/*/index.tsx", // or "source": "./src/*" ?
      "default": "./dist/*/index.js"
    }
  },