Handle appDom versioning

[bharatkashyap]

• [x] I have followed (at least) the PR section of the contributing guide.

• Fixes #741

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[Janpot]

Adding the pseudocode we talked about in last 1-on-1 as a potential starting point

// ./migrations/version1.ts
export default {
  up (dom) {
    invariant(!dom.version || dom.version === '0', 'Can only migrate dom of version 0');
    return dom;
  }
}


// ./migrations/version2.ts
export default {
  up (dom) {
    invariant(dom.version === '1', 'Can only migrate dom of version 1');
    return dom;
  },
  down (dom) {
    invariant(dom.version === '2', 'Can only migrate dom of version 2');
    return dom;
  }
}

// ./migrations/index.ts
import version1 from './version1'
import version2 from './version2'

const versions = new Map([
  ['1', version1],
  ['2', version2],
]);

const latestVersion = Array.from(versions.keys()).pop();

function migrate(dom, version = latestVersion) {
  return //...
}

edit

I'm thinking it would probably be easier to use number for versions, as they are more straightforward to compare

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[bharatkashyap]

Should the migrated dom be written back to the app in the database? Should we save the versions of the dom and keep an audit log?

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