Implement a streaming Identity Debugger

### Is your feature request related to a problem? Please describe.

Sometimes it can be hard to grok why identity data/sdk implementations are not working as expected

### Describe the solution you'd like.

Add a page in the dashboard that shows a real time stream of identities being sent to the API from SDKs. This is similar to real time debugger pages in analytics tools (https://www.docs.developers.amplitude.com/data/debugger/#ingestion-debugger)

### Describe alternatives you've considered

None

### Additional context

We could reuse the identity webhook to stream content back into the app.