Support for Specific File Names (e.g., doc.go)

[AlexJSully]

Summary
Add support for including specific filenames (or filename patterns) in the Workspace Wiki file discovery, even when their extension is already covered by another rule.

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🔍 Problem

Currently the extension discovers files based on extensions only (via workspaceWiki.supportedExtensions).
This works well for typical documentation formats like .md, .txt, etc., but for some languages you might have source files that should be included in the wiki view because they serve as documentation.

Example:

• A file like doc.go in a Go project
• This file is intended to be documentation, not normal source
• But including .go in supportedExtensions would show all Go source files, which is not desirable

So we need a way to include specific file names or name patterns in addition to extension-based discovery.

🧠 Example Use Cases

Use Case	Desired Behavior
doc.go exists	Show doc.go in wiki tree, without showing all .go files
Pattern like *.guide.ts	Show only files matching the pattern