Update the project and event models

- [x] Updation of project model

- Add domain field
- Add document field -many to many to document model
- Add is_team field -boolean field
- Add project_lead - foreign key with member
- Add contributors - many to many field with member model
-Add project_status-choices field with a default value

- [x] Updation of event model

- Add domain field- foreign key with domain
- add event_lead -foreign key with member
- add organiser-many to many with member

- [x] Also create and update the existing views for the same with required access as discussed for domain model