Creates basic Wizard.tsx component

Prompt:
In the newly created package, create the Wizard component.

Note: these docs mention `Wizard.Step` and `Wizard.Footer`. DO NOT create these yet. They will be created later

The `@leafygreen-ui/wizard` is a general-purpose, multi-step page template, designed to create guided in-app flows and wizards:

Based on the MultiStepWizard component in MMS, and intended to be used in the Product Deletion template.

Feature Overview:
- Takes in all Steps in the flow as children.
- Renders the appropriate content for the current step
- Internally handles step changing (with optional external control)

Non-goals:
- We will not be implementing this across MMS (MultiStepWizard is currently used in 26 files)
 - This will not support different url routes per step

Wizard component
The root flow component. Controls the rendering of the appropriate step based on a controlled prop, or uncontrolled internal state.

Example
```tsx
const [activeStep, setActiveStep] = useState(0)

<Wizard activeStep={activeStep}>
  <Wizard.Step
    title="Step 1"
    description={<>Some description with a <Link>link</Link></>}
  >
    Some Content. Lorem ipsum dolor.
  </Wizard.Step>
  <Wizard.Step />
  <Wizard.Step />
  <Wizard.Footer
    backButtonProps={{ onClick: setActiveStep(x--) }}
    cancelButtonProps={{}}
    primaryButtonProps={{ onClick: setActiveStep(x++), variant: 'danger', disabled }}
  />
</Wizard>
```

Props:
```ts
activeStep?: number;
onStepChange?: (step: number) => void
showStepper?: boolean; // omit for v1
```

State:
`[activeStep, setActiveStep] = useState<number> // if none provided as a prop`

Events:
- `onStepChange` : fired when the activeStep changes
  - this should still fire when controlled?

Rendering:
- Renders the appropriate Step based on the activeStep prop/state
- Renders the Footer element, with enabled/hidden buttons based on the activeStep
  - If activeStep === 0, hides back button
- Injects setActiveStep into Back and Primary buttons (if uncontrolled)

Author: TheSonOfThomp

packages/wizard/src/Wizard/Wizard.tsx

@@ -8,6 +8,7 @@ export function Wizard({
   onStepChange,
   children,
 }: WizardProps) {
+  // TODO: replace with `useControlledValue`
   // Internal state for uncontrolled mode
   const [internalActiveStep, setInternalActiveStep] = useState<number>(0);