Implement checks for ratings of sessions by event organizer/owner

[shreyanshdwivedi]

Is your feature request related to a problem? Please describe.

This is a followup issue for #2959

• There is a typo in feedback shema
• There should be checks that feedback can be updated/created only by owner/organizer of the event.

Additional context

Working on it
Related FE PR - #3017

[shreyanshdwivedi]

@CosmicCoder96 please transfer this to server. I opened this issue on FE by mistake