Export makeTornado and makeMonster to JavaScript

[jquast]

makeEarthquake, makeFire and makeFlood are bound; makeMonster and makeTornado were not, so a caller could start neither one:

$ make -C packages/micropolis-engine install
$ cd apps/micropolis
$ node_modules/.bin/tsx -e "import { loadMicropolisMainModule } from './src/lib/wasm/node.ts'; import { createNoopJsCallback } from './src/lib/wasm/callbacks'; (async () => { const e = await loadMicropolisMainModule(); const m = new e.Micropolis(); m.setCallback(createNoopJsCallback(e), {}); m.init(); console.log('makeMonster:', typeof m.makeMonster, 'makeTornado:', typeof m.makeTornado); m.makeMonster(); m.makeTornado(); console.log('sprite types:', m.getActiveSprites().map((s) => s.type)); })();"
makeMonster: undefined makeTornado: undefined
TypeError: m.makeMonster is not a function

The same command after this commit starts one sprite of each:

makeMonster: function makeTornado: function
sprite types: [ 6, 5 ]

Depends on #15 (the loader fix) to run the commands above.