Use fetchApiSingleton to fetch data from Mentors API

[starboi02]

Issue Description

• In the MainActivity create a method named getMentorData to use the fetchApiSingleton instance for fetching data from the API https://raw.githubusercontent.com/opencodeiiita/Collaborative-Web/main/data/mentors.json.
• Create a toast for the error response.
• Create an ArrayList of the Mentor object from the json response.
• Make getMentorData() return ArrayList<Mentor>.

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[shashwat-mittal]

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