React validity

Core principles

• Validators validate one thing and one thing only. This allow for precise error messages that help guide the user.
• Validation does not require a context or the <Form> component and can be done from any component. Not just inputs.
• useValidation and <Form> should only create the absolute minimum amount of re-renders
• Everything should have tests
• There should be a reactive API for building accessable components like an error list
• useValidation will only be async if has async validators. This will decrease the number of re-renders and prevent unnecessary pending states in the components