Convert vCache to a package

### Description
vCache is supposed to be used as a package.

### Impact
- **Who**: Developer and users
- **What**: Package
- **Why**: Usage

### Proposed Solution
Use PIPy

### Acceptance Criteria
- [ ] Followed coding conventions
- [ ] Implemented or updated tests
- [ ] PIPy

### Risks & Dependencies
New changes should not break older package versions.

### Additional Context

