Implement automatic typings for queries & mutations compatible with GraphQL Codegen

[ACERposS]

Hi, not sure if this package is still being maintained but it would be beneficial to have TypeScript support automatically functional with the official client preset.

svelte-apollo@0.5.0.patch

In the meantime the attached patch can be used with PNPM's built-in patching functionality to provide automatic first-class TypeScript support with query and mutation equivalent to that available with the React-based useQuery and useMutation hooks.

(In package.json:)

"pnpm": {
  "patchedDependencies": {
    "svelte-apollo@0.5.0": "patches/svelte-apollo@0.5.0.patch"
  }
}