Add dp client

[sidkos]

This pull request introduces a comprehensive overhaul to the CI/CD pipeline and project documentation, with a strong emphasis on supporting robust component testing and clarifying the separation of deliverables. The changes add a reusable GitHub Actions workflow for component tests, update the Dockerfile to use a startup script, and improve documentation for both the main project and the dp-client client. Additionally, the dp-client package is refactored for clearer imports and versioning.

CI/CD and Testing Improvements

• Added a reusable GitHub Actions workflow for component tests (.github/workflows/component_tests.yml), which runs server and database in containers, waits for readiness, installs dp-client, and executes tests. This enables isolated, reliable component testing in CI.
• Integrated the new component test workflow into the main CI/CD pipeline (.github/workflows/ci_cd.yml), ensuring component tests run automatically after building the server image.
• Updated static code analysis and component test steps to use the new build_and_install_dp_client.sh script for installing the client, replacing the previous OpenAPI client install script.

Containerization

• Changed the Dockerfile to use a dedicated startup script (start_server_in_container.sh) for running the server, improving maintainability and flexibility.

Documentation and Project Structure

• Rewrote the main README.md to provide a project overview, clarify the separation of server, client, and test client, document requirements files, and explain CI/CD flows and release strategy.
• Added a dedicated dp-client/README.md describing its architecture, usage, configuration, requirements, and best practices for release and repository separation.

dp-client Package Refactoring

• Refactored dp-client imports in dp_client/__init__.py and dp_client/api/__init__.py for clearer API exposure and added dynamic version detection for the package. [1] [2]