fix(components): include side effects from src for rollup resolution

[joshblack]

Closes #7773

Adds in the relevant src files to the sideEffects array to correctly emit our document event listeners on boot.

Changelog

New

Changed

• Update sideEffects in components/package.json to include source files so that rollup's node-resolve plugin correctly emits imports that have side effects

Removed

Testing / Reviewing

• Checkout the PR
• Build the components package locally (yarn gulp scripts:rollup is a nice shortcut in packages/components)
• Check out scripts/components.js and verify that the following block of code appears at the end:

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    // DOMContentLoaded has been fired already
    // Let consumer have chance to see if it wants automatic instantiation disabled, and then run automatic instantiation otherwise
    setTimeout(init, 0);
  }

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[tw15egan]

LGTM 👍 ✅

[dakahn]