New Build Tasks and Utility Function for Maintenance Automation

[mdaneri]

What's New

This PR introduces four new Invoke-Build tasks and a utility function to streamline internal maintenance of the Pode project:

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Format-FunctionHeaders

• Automatically formats the headers of all functions within .ps1 files.
• Enforces Pode's function header style and layout guidelines.
• Useful for keeping public/internal scripts consistent and clean.

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Refresh-HeaderFooter

• Inserts or updates the file-level header and footer blocks in .ps1 files.
• Ensures all source files follow Pode’s standard file documentation format.
• Footer can be useful for file integrity or tooling metadata.

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AutoMerge-LanguageFiles

• Helps reduce manual overhead and common conflicts during Git merges.
• Language files are frequent sources of merge issues due to unordered keys or manual edits.

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Sort-LanguageFiles

• Sorts all language files alphabetically by key.
• Makes diffs cleaner and ensures consistent key order across locales.
• Especially useful after merges or bulk string additions.

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Group-LanguageResource (Function)

• Internal function used to group and structure localized strings.
• Supports the AutoMerge and Sort tasks with predictable formatting.
• Groups resources by logical section (if present) to enhance readability.

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These additions aim to reduce manual overhead, maintain codebase cleanliness, and ensure internationalization consistency across the Pode project.