Add serialization context for RPC on apphost side

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

There is no way today to serialize a enum for example from both cli and apphost side - they are not using the same type with same namespace, and they cant sync to serialize/deserialize them properly together. We should have a way to control serialization on apphost side

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Exceptions (if any)

_No response_

### .NET Version info

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### Anything else?

_No response_