Add changeset

Author: eddeee888

.changeset/lovely-sloths-kiss.md

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+---
+'@graphql-codegen/typescript-operations': major
+'@graphql-codegen/typescript': major
+'@graphql-codegen/client-preset': major
+---
+
+BREAKING CHANGE: `typescript` plugin no longer generates `Exact` utility type. Instead, `typescript-operations` generates said utility type for every file it creates. This is because it is used _only_ for `Variables`, so we only need to generate it once for every generated operation file.