fix: resolve request hang with pageSize and fetchLinks

[angeloashmore]

Resolves: #435

Description

Fixes an issue where getByType() and similar methods hang indefinitely when using pageSize: 100 combined with fetchLinks on repositories with many documents.

The issue was introduced in v7.19.2 when request deduplication was refactored. Multiple callers sharing a deduplicated request would each try to read from the same response stream, causing hangs with large responses.

The changes in this PR result in ~2x faster responses compared to v7.18 and ~5x faster than v7.19 in the specific scenario detailed in #435.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

N/A

How to QA ¹

1. Run existing tests: npm test
2. Manual test with a repository that has 100+ documents:

   const client = prismic.createClient("your-repo")
   const results = await client.getByType("your-type", {
     pageSize: 100,
     fetchLinks: ["linked_type.field1", "linked_type.field2"],
   })

🦥

---

Note

Medium Risk
Touches the core request/deduplication layer and subtly changes ResponseLike.clone() semantics, which could affect downstream code that relies on independent response streams.

Overview
Fixes deduplicated GET requests so multiple callers don’t compete for the same response body stream.

This wraps deduplicated fetch() responses in a memoizing ResponseLike (memoizeResponse) that caches text(), json(), and blob() reads using clone(), and stops returning response.clone() at the end of request() (returning the memoized wrapper instead).

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