add changelog

packages/api/CHANGELOG.MD

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+# Changelog
+
+## [6.0.0]
+
+### ⚠️ Breaking Changes
+
+- **ApiClient data format changed**: The `ApiClient` class constructor now expects variables in JSON format instead of params.
+- **Method name change**: To call the client, use `request` instead of `query`.
+
+### Added
+
+- **`rawRequest` method**: Allows fetching data in the old format, returning `data`, `errors`, `extensions`...
+- **Versions validation**: The client now validates the version of the API it’s interacting with.
+- **Enhanced request configuration**: The `ApiClient` class now accepts a `requestConfig` object, allowing for additional customization options.
+- **`ClientError` type for error handling**: Introduced the `ClientError` type, providing a structured format for handling errors consistently within the `ApiClient`.
+
+### Fixed
+
+- **GraphQL library dependency**: Resolved an issue where the GraphQL library was sometimes required as a dependency; this is now included by default.