🐛[Bug] Export AppliesToEligibility and ProductOrCollectionResource types

[vincaslt]

Issue summary

AppliesToEligibility and ProductOrCollectionResource are not exported in @shopify/discount-app-components, so they can't be easily used to give types to form field values:

eligibility: useField(AppliesToEligibility.Products),
selectedItems: useField<ProductOrCollectionResource[]>([]),

<AppliesTo
  eligibility={eligibility}
  selectedItems={selectedItems}
/>

Expected behavior

Actual behavior

Steps to reproduce the problem

1. First step
2. Second step

Reduced test case

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Specifications

• Are you using the React components? (Y/N):
• discount-app-components version number:
• Browser:
• Device:
• Operating System:

Or run npx envinfo --system --binaries --browsers --npmPackages react,react-dom,@shopify/discount-app-components to provide specifications on your environment including version numbers, browser, device, and operating system.

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