Add custom response parser option and enhance binary data handling

[MattCCC]

This pull request introduces support for a custom parser option in the request configuration, allowing users to fully control how HTTP responses are parsed. It also refines the default binary response parsing behavior to use ArrayBuffer for a broader set of binary content types, and updates the response wrapper to provide consistent, idempotent methods for accessing parsed data. Documentation and tests have been updated to reflect these enhancements.

✨ Features & Improvements

• Added Custom Response Parser - parser option to config (both global and per-request) for custom response parsing.
• Improved binary response handling:
  • response.data is now ArrayBuffer for binary content types.
  • .blob() and .bytes() methods create and return Blob / Uint8Array on demand.
• Documented parser option with XML/CSV examples and fallback parsing order.
• Clarified default handling for XML, CSV, and custom content types: returns raw text unless a parser is provided.
• Updated README to reflect new response parsing behavior and binary data access patterns.

[github-actions]

size-limit report 📦

Path	Size
dist/browser/index.mjs	5.67 KB (+0.51% 🔺)
dist/browser/index.global.js	5.85 KB (+0.19% 🔺)
dist/node/index.js	5.75 KB (+0.09% 🔺)
dist/react/index.mjs	8.7 KB (-0.03% 🔽)
dist/react/index.js	9.48 KB (+0.07% 🔺)