feat: smart contract type derivation

[harrysolovay]

This PR adjusts type derivation such that we can supply smart contract type metadata. Enables us to start building out a higher-level contracts API.

// Import the contract's metadata
const raw = await Deno.readTextFile("frame_metadata/raw_erc20_metadata.json");

// Normalize that metadata (`normalize` is from `frame_metadata/Contracts.ts`)
const normalized = normalize(raw);

// Create the codec derivation fn
const deriveContractType = DeriveCodec(normalized.V3.types);

// Derive a specific codec
const probablyU128 = deriveContractType(0);

const encoded = probablyU128.encode(101);
const decoded = probablyU128.decode(encoded);