feat: migrate to @esotericsoftware/spine-pixi-v7

[yordan-kanchelov]

This pull request involves significant changes to the project, including updating dependencies, refactoring asset files, and converting TypeScript configuration files to CommonJS. The most important changes are summarized below:

Dependency Updates:

• Replaced the pixi-spine dependency with @esotericsoftware/spine-pixi-v7 in package.json and updated the corresponding import statements in src/index.ts and src/utils/spine-example.ts. [1] [2] [3]

Asset Refactor:

• Removed pixie assets and added new spineboy assets in assets/spine-assets/pixie.atlas and assets/spine-assets/spineboy.atlas. [1] [2]
• Updated asset loading in src/index.ts to use the new spineboy assets.

Configuration Changes:

• Converted webpack.config.ts, webpack.dev.ts, and webpack.prod.ts to CommonJS format (webpack.config.cjs, webpack.dev.cjs, webpack.prod.cjs). [1] [2] [3] [4] [5] [6] [7]

These changes streamline the project dependencies, update asset management, and ensure compatibility with CommonJS module format.

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