Zod Integration

Here's a proposal

1. Create garph types from Zod types:

```ts
const type = g.zodType('name', yourZodType)
```

2. Create garph scalars from Zod types:

```ts
const type = g.zodScalar('name', yourZodType)
```

3. Create garph inputs from Zod types:

```ts
const type = g.zodInput('name', yourZodType)
```

4. Create Zod types from Garph types:

```ts
type.toZod()
```