feat: Add generic types and Complex numbers (#21)

Generic types can be called with argument(s) to produce a new type object, and if all types supplied as arguments are concrete, then the result will be a concrete type. The test of a generic type must determine if the entity is an instance of any specialization of the type; and it must also have a `refine` method that takes such an instance and returns its fully-specialized concrete type. It must also have a method `specializesTo` that takes a concrete type and returns whether that concrete type is a specialization of this generic type.

This commit also defines a generic Complex number type, that can have any type as its Component type (including another Complex number, to create e.g. quaternions), and defines the conversion/constructor function `complex`.

Reviewed-on: #21
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

src/complex/__test__/complex.spec.js

@@ -0,0 +1,12 @@
+import assert from 'assert'
+import math from '#nanomath'
+
+describe('complex type operations', () => {
+   it('converts to number', () => {
+      assert.deepStrictEqual(math.complex(3), {re: 3, im: 0})
+      assert.deepStrictEqual(math.complex(NaN), {re: NaN, im: NaN})
+      assert.deepStrictEqual(math.complex(3, -1), {re: 3, im: -1})
+      assert.deepStrictEqual(math.complex(false, true), {re: false, im: true})
+      assert.throws(() => math.complex(3, false), RangeError)
+   })
+})