Add synchronous mode to @curi/core

[pshrmn]

Current Behavior

Currently response generation is asynchronous, which allows any match.initial and match.every functions to run prior to emitting a new response.

New New Behavior

When no route object has a match.initial or match.every function, the router will automatically match routes synchronously.

[pshrmn]

Update

Instead of manually selecting synchronous mode, Curi will default to synchronous, but switch to async if any route has an initial or every property.

// sync
const routes = [
  { name: Home, path: '' },
  { name: Other, path: 'other' }
];

// async
const routes = [
  { name: Home, path: '' },
  {
    name: Other,
    path: 'other'
      match: {
        initial: () => Promise.resolve('some value'),
        response({ resolved }) => {...}
      }
  }
];