Ceramic SDK performs client-side schema validation

[mzkrasner]

The ModelInstanceClient does not currently make use of some existing schema validation utilities found in model-instance-handler package that perform schema validation (checking against field constraints, etc). Additionally, better integrating this package into the ModelInstanceClient will make the package more ergonomic and easy to work with, reducing boilerplate code for users.

At current state, users can manually combine methods from these separate packages. Resolution of this issue would make this disparate functionality generally easier to work with for users.