Add del update api

[sidkos]

This pull request introduces significant enhancements and refactoring to the Python dp-client library and its documentation, focusing on expanding the supported user API endpoints, enforcing stricter validation, and improving testability and maintainability. The changes also clarify API usage and validation rules in the documentation, and add a comprehensive test matrix for both unit and component tests.

API and Client Improvements:

• Expanded UsersApi and DPClient to support all user CRUD operations (create, retrieve, list, update, partial_update, destroy), with strict id immutability enforced and robust endpoint validation at initialization. The client now injects the path id for PUT if omitted and rejects PATCH bodies containing id. [1] [2] [3]
• Refactored internal typing and endpoint loading to use explicit imports, type hints, and runtime checks for endpoint presence, ensuring compatibility with the generated metadata_client and clearer error handling. [1] [2] [3] [4]
• Improved public API surface for dp-client, including __all__ exports for top-level symbols and more precise type hints throughout.

Documentation and Usability:

• Updated README.md to clarify the API endpoints, validation rules (notably id immutability), and usage patterns for the client, including detailed examples for all CRUD operations. [1] [2]
• Added a comprehensive test matrix to the documentation, detailing unit and component test coverage, what each test verifies, and how to run them.

Testing and DB Helpers:

• Improved DB driver typing and usage for component tests, ensuring correct type hints and usage of psycopg2 connections.

Grouped by Theme:

API Expansion and Validation

• Added support for all user CRUD operations in UsersApi and DPClient, enforcing id immutability and robust endpoint validation at initialization. [1] [2] [3]
• Improved internal typing and endpoint loading strategy, with explicit imports and runtime checks for endpoint presence. [1] [2] [3] [4]

Documentation and Testing

• Updated documentation to clarify API endpoints, validation rules, and usage patterns, including examples for all CRUD operations. [1] [2]
• Added a detailed test matrix to README, describing unit and component test coverage and execution instructions.

Codebase and Typing Improvements

• Improved public API exports and type hints, enhancing maintainability and usability for downstream projects. [1] [2]