Add persistent component cache

[pavelisnear]

This PR is built on top of the previously reverted #288

Introduces a a persistent component cache:

Test example component (compatibility with the block height feature)

import BlockHeightWithFlagTest from 'near://pavel-pagoda.near/BlockHeightWithFlagTest@115592558';
import BlockHeightWithFlagTestLatest from 'near://pavel-pagoda.near/BlockHeightWithFlagTest';

export default function () {
  return (
    <div>
      <h1>Sandbox with a block height:</h1>
      <BlockHeightWithFlagTest />
      <hr />
      <h1>Sandbox latest:</h1>
      <BlockHeightWithFlagTestLatest />
    </div>
  );
}

Fixes #303

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[andy-haynes]

Looking good! Just some questions and suggestions but nothing major.

[andy-haynes]

Looks awesome! I added notes on a couple minor things I noticed, take a look when you rebase and we'll get this out 🎉

[andy-haynes]

Excellent work ❤️