Improve support for different Angular versions

[sweep-ai]

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Description

This PR aims to improve the compatibility of the library with different Angular versions. It introduces separate packages for each major Angular version and includes demo components to showcase the compatibility.

Summary of Changes

• Created new packages for Angular 10, Angular 11, and Angular 12 in the components/confetti/projects directory.
• Added package.json files for each Angular version with the necessary dependencies and configuration.
• Modified the angular.json file to include the new packages and update their configuration.
• Updated the README.md file to include instructions for running the demo app for each Angular version.
• Updated the package.json file to include the new packages as dependencies.
• Created new demo components for Angular 10, Angular 11, and Angular 12 in their respective package directories.

Please review and merge these changes to improve the library's compatibility with older Angular versions.

Fixes #65.

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