Add Metadata Admin Screens to OSMT

[Corpratespaz]

1. Create infrastructure

• [x] Create service classes for UI #391
• [x] Create backend endpoints #397

2. Create abstract implementations

• [x] Create search/filter UI components #401
• [x] Create CRUD detail UI components #433

3. Create concrete implementations

• [x] Implement Keyword search/filter #426
• [x] Implement Jobcode search/filter #411
• [x] Implement Keyword CRUD #421
• [ ] Implement Jobcode CRUD #447