safe-global / safe-client-gateway / 10452957617 / 1

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Allow optional signature when registering notifications (#1797)

This adapts the `POST` `/v2/register/notifications` endpoint to make the `accessToken` optional and, if not present, register for notifications as a non-owner/delegate with no `signer_address` saved. When notifications are dispatched, if no `signer_address` is present, only "public" notifications are therefore dispatch to the related Firebase token:

- Make `notification_subscriptions['signer_address']` column nullable
- Allow upsertion of subscriptions without a signer address, adapting the logic to first clear the subscription if the signer address matches or is undefined in order to "align" subscriptions.
- Add/adjust tests accordingly.

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