feat: introduce event owner role to the system

[shreyanshdwivedi]

Reference - #3225
Server PR - fossasia/open-event-server#6131

Short description of what this resolves:

Recently, event owner role is added to server. This is a follow-up PR to ensure the changes are applied to FE too

Changes proposed in this pull request:

• Adds owner to admin-statistics-user
• Changes hasOrganizerInfo, organizerName, organizerDescription to -> hasOwnerInfo. ownerName, ownerDescription respectively in event model.
• Adds owner relationship to event model
• Adds isUserOwner and ownerEvents to user model.
• Adds owner to event-role permissions
• Make relevant changes to template to accomodate above mentioned changes

Manage Events

Event Owner Permissions

Admin Events

Admin Dashboard

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[kushthedude]

@shreyanshdwivedi Make the changes in Admin/Dashboard too

[shreyanshdwivedi]

@kushthedude which changes? I'll suggest you to pull the changes and check because I think I already implemented what you're suggesting. Please check if I left any place which needs refactor too.
Thank You

[kushthedude]

Multiple Roles not getting shown in Roles Column :

No Of Owners not getting rendered in Admin Dashboard :

[kushthedude]

Permissions Panel needs updation too :

[shreyanshdwivedi]

@kushthedude please refer to my screenshots for first issue. Multiple roles are getting rendered.
For other issues, I've already opened a server PR. Forgot to link it - fossasia/open-event-server#6131
This can be merged after server PR is merged

[abhinavk96]

Merging this urgently, as the server is already about to go in production, Send follow up PRs if there are bugs.

[kushthedude]

@shreyanshdwivedi Great, so we can cover each and every refactor in various PRs to test it properly

Make any changes, you want. Not going into production now.

[shreyanshdwivedi]

@kushthedude @uds5501 @mrsaicharan1 please review

[shreyanshdwivedi]

@uds5501 @kushthedude @CosmicCoder96 the server PR is merged. This PR is ready to be reviewed and can be merged