Add docs and checks

[xalbertoisorna]

• Update .gitignore to include _build and dist directories.
• Enhance Jenkinsfile with VX4 build stage.
• Create exclude_patterns.inc for documentation generation.
• Add lib_unity.rst for project documentation.
• Introduce CMakeLists.txt and main.c for basic example tests.
• Implement test_basic.c with unit tests for addition, division, and sine functions.
• Modify CMakeLists.txt for uut_and_tests to target XK-EVK-XU316.
• Add settings.yml for project configuration and documentation settings.