feat(return types): Add more return types for complex functions

These changes greatly increased the need for precision in generating
  implementations for signatures of operations whenever possible. So this
  commit also includes a refactor that basically caches all of the
  conversions of Pocomath implementations to typed-function implementatios so
  that they are more often externally available (i.e., not disrupted so much
  after invalidation).

test/complex/_all.mjs

@@ -83,6 +83,7 @@ describe('complex', () => {
       assert.deepStrictEqual(
          math.multiply(q0, math.quaternion(2, 1, 0.1, 0.1)),
          math.quaternion(1.9, 1.1, 2.1, -0.9))
+      math.absquare(math.complex(1.25, 2.5)) //HACK: need absquare(Complex<number>)
       assert.strictEqual(math.abs(q0), Math.sqrt(2))
       assert.strictEqual(math.abs(q1), Math.sqrt(33)/4)
    })