refactor: Switch to 'map-like object keyed by string and type vector' format

See https://code.studioinfinity.org/glen/nanomath/wiki/Item-Specifications.
  Also stubs out the TypeDispatcher, mocking the merge function, so we
  can see that all of the proper things will be added.

  Ready for initial implementation of the TypeDispatcher.

src/nanomath.js

@@ -1,7 +1,6 @@
+import {TypeDispatcher} from './core/TypeDispatcher.js'
 import {numbers} from './numbers.js'
 
-for (const key in numbers) {
-    for (const subkey in numbers[key]) {
-        console.log(`${key}.${subkey} =`, numbers[key][subkey])
-    }
-}
+const math = new TypeDispatcher(numbers)
+
+export default math