feat: support reading codecs directly ref-d from objects

[bitgopatmcl]

Adds support for directly referencing a codec inside another local or imported object literal:

const GroupOfCodecs = {
  one: t.string,
  two: t.number,
}

export const MyObject = t.type({
  foo: GroupOfCodecs.one,
  bar: GroupOfCodecs.two,
});

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