Added error message when no Email data provided

[yifanplanet]

Description

• For Email component, if user didn't pass any one of the following properties, we show the error message saying that no email data provided:
  • thread, thread_id, message or message_id
• To correctly show this message in component's lifecycle, we only show it after component is mounted and $$props are loaded.
• For users who want to control the time when the email data is passed in, added new Email component property loading to allow it to show a loading spinner when no email data provided.

Code changes

• [x] Added handleError in Email component when no email data is populated
• [x] Update nylas-error component to include the link to the corresponding Nylas Docs

Readiness checklist

• [x] Added changes to component CHANGELOG.md
• [x] Cypress tests passing?
• [x] New cypress tests added?
• [x] Included before/after screenshots, if the change is visual

Screenshots

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

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