[WIP] [FEATURE] Create automated check for each JS/TS relevant tech in order to ensure that library can be installed and used correctly

[Copilot]

• Create integration test structure with sandbox projects
• Implement Node.js CommonJS sandbox with basic monad usage tests
• Implement Node.js ESM sandbox with basic monad usage tests
• Implement TypeScript sandbox with type checking and usage tests
• Implement Next.js sandbox with React component using monads
• Implement Astro sandbox with component using monads
• Create main test runner script that builds library and runs all sandboxes
• Add integration tests to CI/CD pipeline
• Update documentation with integration testing information

Fixes #65.

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