This pull request includes several changes to the CI scripts, workflow configurations, and example files to improve the build and validation processes, as well as to simplify the usage of example documents.

CI and Workflow Improvements:

• .ci/build-examples.sh: Added a new script to build Go examples and capture build errors.
• .ci/validate-examples.sh: Added a new script to validate examples, including running and validating docx, xlsx, and pptx files.
• .github/workflows/ci.yml: Added a new GitHub Actions workflow for CI to build and validate examples across multiple Go versions.

Example File Simplifications:

• document/comment-list/main.go, document/comment-remove/main.go, document/node-remove/main.go, spreadsheet/line-chart-from-csv/main.go: Simplified example usage by removing command-line arguments and using hardcoded file names. [1] [2] [3] [4] [5] [6] [7] [8]

Documentation and Metadata:

• README.md: Added a section on metered license key usage logs and how to enable verbose mode logging.
• license/usage-logs/README.md: Removed redundant information about metered license key usage logs.

New Example:

• presentation/use-template-sales/main.go: Added a new example demonstrating how to use a presentation template with sales data.

These changes collectively enhance the CI process, simplify the usage of example scripts, and improve documentation for better clarity and usability.