Function normalizeGlob

Normalizes glob patterns to be consistent with ripgrep behavior.

Examples of transformations:

• ".js" -> "**/.js" (make non-root patterns match anywhere)
• "src/" -> "src/**" (directory patterns match all contents)
• "!.log" -> "!**/.log" (negation patterns)
• "src///file.js" -> "src/**/file.js" (collapse repeated double-star patterns)