fix: support splatting properties from a known import

[bitgopatmcl]

Fixes the case where an object is imported from an external (but defined) library and then spread into another object:

import { commonParams } from 'some-other-lib';

export const MyObject = t.type({
   ...commonParams,
   additionalParam: t.string,
});

[andrew-scott-fischer]

https://github.com/BitGo/api-ts/actions/runs/6239400599/job/16937234716?pr=561#step:6:41

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