Type projectID as number in web components

### How are you running Flagsmith

- [x] Self Hosted with Docker
- [x] Self Hosted with Kubernetes
- [x] SaaS at flagsmith.com
- [ ] Some other way (add details in description below)

### Describe the bug

ProjectIDs were wrongly typed as string while it is supposed to be a number type

### Steps To Reproduce

N/A

### Expected behavior

The type definitions should treat the projectID as a number and only converts to string if needed

### Screenshots

_No response_