Add task type selector for code suggestions

What does this MR do and why?

Add task type selector for code suggestions

This commit adds a new class ModelSelector in the CodeSuggestions module that determines the type of code suggestion task based on the prefix and suffix. It uses a regex to look for specific 'magic comments' that can trigger different types of code suggestions.

This will enable more dynamic and contextually appropriate code suggestions based on user input.

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Related to #421316 (closed)