feat(core): add enhanced wait strategies with comprehensive testing

- Add HttpWaitStrategy for HTTP endpoint waiting with TLS, auth, headers support
- Add HealthcheckWaitStrategy for Docker health check status monitoring
- Add PortWaitStrategy for TCP port availability checking
- Add FileExistsWaitStrategy for filesystem file existence waiting
- Add CompositeWaitStrategy for combining multiple wait conditions
- Include comprehensive unit tests for all new strategies
- Enhanced error messages with actionable hints for debugging
- Maintain backward compatibility with existing LogMessageWaitStrategy
- Fix mypy type annotations for all new wait strategies

Author: terry-docker