chore: add changesets

Author: rdunk

.changeset/fifty-taxis-brake.md

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+---
+'@sanity/image-url': major
+---
+
+**BREAKING:** Export all public types from main export path
+
+All TypeScript types are now exported from the main package entry point instead of internal `/lib` directory paths. This provides a stable, public API for type imports.
+
+**Migration:** Update type imports to use the main export path:
+
+```diff
+- import type {SanityImageSource} from '@sanity/image-url/lib/types/types'
++ import type {SanityImageSource} from '@sanity/image-url'
+```

.changeset/icy-papers-study.md

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+---
+'@sanity/image-url': major
+---
+
+**BREAKING:** Drop CommonJS support, move to ESM only
+
+The package now exclusively uses ES modules. CommonJS `require()` syntax is no longer supported.
+
+**Migration:** Replace `require()` statements with `import` statements:
+
+```diff
+- const urlBuilder = require('@sanity/image-url')
++ import {createImageUrlBuilder} from '@sanity/image-url'
+```

.changeset/poor-readers-share.md

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+---
+'@sanity/image-url': major
+---
+
+**BREAKING:** Replace default export with named export
+
+The main function is now exported as `createImageUrlBuilder` instead of a default export.
+
+**Migration:** Update your imports:
+
+```diff
+- import imageUrlBuilder from '@sanity/image-url'
++ import {createImageUrlBuilder} from '@sanity/image-url'
+
+- const builder = imageUrlBuilder(client)
++ const builder = createImageUrlBuilder(client)
+```