feat(results): Add Test Results datasource and its query editor

[Ahalya-ni]

Pull Request

🤨 Rationale

Feature : Feature 2605755 : Grafana support for results datasource

As part of Add Results Query editors to the Results Datasource user story, this PR contains the addition of the Results Datasource along with basic controls in the query editor to fetch results details.

👩‍💻 Implementation

• Created ResultsDataSource class with methods to query results and run queries.
• Defined types and interfaces for result queries and responses.

Output Type: Data
Output Type: Total Count

🧪 Testing

• Added unit tests for the Datasource

✅ Checklist

• This PR has a title that follows the commit message format.