NRL-1061 Add imaging postman collection

[hamzakhan24-nhs]

Added imaging postman collection which contains the following:
Producer and Consumer API test examples for new imaging types and categories
Example validation tests.

[github-actions]

🚀 PR environment successfully deployed.
Commit Hash: 76655c9d837635771dab25f8379c61fff7d0f411
URL: https://nrl1061-661617.api.record-locator.dev.national.nhs.uk/

[github-actions]

🚀 PR environment successfully deployed.
Commit Hash: 1d7700fb6932c61edec0982da3d3bdf604b85921
URL: https://nrl1061-661617.api.record-locator.dev.national.nhs.uk/

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🚀 PR environment successfully deployed.
Commit Hash: c10f17e460d5b82c4226219732f4d6d21f782597
URL: https://nrl1061-661617.api.record-locator.dev.national.nhs.uk/