Support customizable content types

[danielnaab]

As part of #21, this defines a structure of adding additional form content types to a form definition.

This branch adds a FormConfig type to define injectable form field definitions. In the design package, there's a FormUIContext, and both would be good to iterate on as part of #43 or #25.

The general structure of working with a form now looks like this:

/*
 * On the content generation-side, we create a form and then save it for later usage.
 */

// Create a form system configuration, which defines the content types used by the form system.
const config: FormConfig = { /* ... */ };

// Create a form definition. This is what the content producer creates via the form builder interface.
const form: FormDefinition = { /* ... */ };
// Or, use a utility function as a helper factory
//const form = createSequentialForm( /* ... */ );

// We can now save this form with the form service, where we can interact with it in the future.
const formService: FormService = createFormService();
formService.saveForm(form);

/*
 *  On the public-facing side, we can fill this form out.
 */

const form = formService.getForm(id);

// Create a session. This tracks the current state of an end-user's journey through the form.
const session = createFormSession(form);

// Create a prompt. Prompts define what the user interface should display, and what operations are legal given the current state of the session.
const prompt = createPrompt(config, session);

// Submit collected data to a backend, where something can be done with it.
const collectedFormData: Record<string, string> = {}; // a mapping of form field IDs to values - what the user entered via the UI
const formService = createFormService();
formService.submitForm(form.id, collectedFormData);

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