chore(alarms): Standardize import quotes and reorganize AlarmsDataSourceCore

[Ahalya-ni]

Pull Request

🤨 Rationale

This PR cleans up the alarms datasource by updating import statements to use single quotes instead of double quotes. It also moves the AlarmsDataSourceCore file and its test file from the alarms root directory to the query-type-handlers folder, as this file is an abstract class containing methods and properties shared by various query type datasources such as ListAlarmsDataSource, AlarmTrendDataSource, and AlarmsCountDataSource.

👩‍💻 Implementation

• Updated import statements to use single quotes.
• Moved AlarmsDataSourceCore and its test file from the root directory to the query-type-handlers folder.
• Renamed AlarmsDataSourceCore to AlarmsQueryHandlersCore as it better represents what the class actually does - it serves as a core foundation for handling different types of alarm queries (list alarms, alarms count, and alarm trend).
• Updated casing for DefaultQueries.constants.ts file name to maintain consistency.
• Removed types.ts file, as the root types were previously deleted when we moved them into a dedicated types folder. The file was mistakenly restored during the latest main merge in the same PR.

🧪 Testing

NA

✅ Checklist

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