Update chat related functionalities to work with the updated chat schema (GSoC)

[disha1202]

Is your feature request related to a problem? Please describe.
Update chat related functionalities to work with the updated chat schema

Describe the solution you'd like
Update chat related functionalities to work with the updated chat schema

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Potential internship candidates
Please read this if you are planning to apply for a Palisadoes Foundation internship PalisadoesFoundation/talawa#359

[disha1202]

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[akshayw1]

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[github-actions]

This issue did not get any activity in the past 10 days and will be closed in 180 days if no update occurs. Please check if the develop branch has fixed it and report again or close the issue.