fix: Extend types

[imp-dance]

Fixes #12 (Extending transform only works when at the end of a chain)

The example given in the issue now resolves correctly:

const test = createLoader({
  useQueries: () => ({
    queries: {
      query1: useCreateQuery(async () => "foo" as const),
    }
  }),
}).extend({
  transform: (data) => data.queries.query1.data,
}).extend({
  onLoading: () => <div>Loading...</div>,
})

// Resolves to "foo", which is correct
type Data = Types.InferLoaderData<typeof test>;

This also does not seem to break any of the other types, atleast not the ones present in tests.test.tsx or testComponents.tsx - which covers quite a wide range of variations.

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[imp-dance]

Published beta-release 1.0.1-beta.0. Will test changes properly to ensure that this does not break any other types that used to work before. If everything looks good, I'll publish a new release, 1.0.1