Auto-generate human-readable folder names for pages in .pbir format

[tsanzo-wwm]

Description:
Currently, Power BI Desktop generates cryptic folder names (like 3f52a0902d346c537710 or ReportSection123abc...) for pages in the enhanced .pbir report format, even though the page's displayName is stored correctly in the page.json file.

Requested Feature:
Automatically use the page's display name as the folder name in the /definition/pages/ directory, with appropriate sanitization for file system compatibility (spaces to underscores, remove special characters, handle duplicates with numbering).

Benefits:
- Improved developer experience and code maintainability
- Easier navigation of report structure in file explorers and IDEs
- Better Git diffs and version control tracking
- Consistent with modern development practices where folder names are human-readable

Example:
Instead of: /definition/pages/3f52a0902d346c537710/
Generate: /definition/pages/Sales_Dashboard/

This would make the enhanced .pbir format much more developer-friendly while maintaining all existing functionality.

[lspector1]

Copying and pasting report names when sending links across an organization is a big issue.