feat: automated registry

[gjj]

In this MR, we demonstrate the usage of Google Sheets as an alternative registry storage, instead of the static registry.json.

Key changes:

• Since an API key is needed to access the Google Sheets data, OpenCertsVerificationManagerOptions now extends VerificationManagerOptions in OpenAttestation to include googleApiKey, so that it can be used in the registryVerifier.verify() method.

  • Rationale: (a) did not want to hardcode the Google API key for obvious reasons, (b) registry is OC-specific, so I'm adding this here instead of the OA library

• Added GoogleSpreadsheetValues to follow the spreadsheets.values API

Temporary changes (will be reverted):

• Added dist files so that the feature branch on opencerts-websites can build properly

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