feat: v4

[samialdury]

Version 4

• [x] migrate to Node 18
• [x] migrate to ESM
• [x] use TypeScript 5
• [x] use pnpm package manager
• [x] large refactoring
• [x] update all dependencies
• [x] improve test coverage
• [x] stricter build & lint rules
• [x] graceful shutdown
• [x] optimized Dockerfile
• [x] Github Actions improvements
  • [x] CI pipeline
  • [x] new integration step
  • [x] build Docker image for every PR
  • [x] Release pipeline
  • [x] publish to GitHub Packages
  • [x] publish to Docker Hub
• [x] remove Dependabot
• [ ] use Renovate bot - will be done in next PR