feature: DatoCMS collection helper

[jbmoelker]

Changes

• Adds a datocmsCollection helper function to fetch all records in a DatoCMS collection.
• Uses pagination so even if a collection has more than 100 records (DatoCMS query limit) it will still return all records.
• Is flexible enough for different use cases, by accepting a GraphQL fragment as an argument to use for the given collection.
• Extends datocmsRequest with retry on rate limit error.

Simplified example (without types):

import { datocmsCollection } from '@lib/datocms';

const pages = await datocmsCollection({ 
  collection: 'Pages',
  fragment: `slugs: _allSlugLocales { locale, value }`,
});

Associated issue

Resolves #74

How to test

1. Checkout this branch locally
2. Force pagination, by changing recordsPerPage to 1 in the new datocmsCollection function in lib/datocms.ts
3. Run a local build
4. Verify all the pages are still generated in dist/[locale]/
5. Verify all the pages are also still generated in the Cloudflare deploy preview

Checklist

• I have performed a self-review of my own code
• I have made sure that my PR is easy to review (not too big, includes comments)
• I have added/updated tests to prove that my feature works (if not possible please explain why)
• I have made changes to the README and if the change affects the project setup (npm commands changed, new service added, environmental variable added) will add this to docs/data-loading.md (see Missing docs #71)
• I have added a decision log entry if the change affects the architecture or changes a significant technology
• I have notified a reviewer

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	e4e0b68
Status:	✅  Deploy successful!
Preview URL:	https://df81fbc6.head-start.pages.dev
Branch Preview URL:	https://feat-datocms-collection.head-start.pages.dev

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