feat: Implement BitipClient for GeoIP service integration
- Add BitipClient class for interacting with the Bitip GeoIP Service.
- Implement methods for health check, version info, IP location lookup, detailed IP location, and batch IP lookup.
- Introduce validation for IP addresses with IpValidator utility.
- Normalize URLs with UrlNormalizer utility.
- Create constants for API keys and routes.
- Add TypeScript types for client options, responses, and errors.
- Set up ESLint and Prettier configurations for code quality.
- Add unit tests for BitipClient and IpValidator.
- Configure TypeScript and build settings with tsup.
- Set up Vitest for testing framework and coverage reporting.
