chore: add changesets

Author: rdunk

.changeset/fifty-taxis-brake.md

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+---
+'@sanity/image-url': major
+---
+
+Export all public types from the main package entry point. Replaces type imports from internal `/lib` paths.

.changeset/icy-papers-study.md

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+---
+'@sanity/image-url': major
+---
+
+Dropped CommonJS support. The package is now ESM only; use `import` syntax instead of `require()`.

.changeset/poor-readers-share.md

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+---
+'@sanity/image-url': major
+---
+
+Replaced the default export with a named export. Use `createImageUrlBuilder` instead of the default export.