safe-global / safe-client-gateway / 10262357287 / 1

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Add `NotificationsDatasource` with migration (#1756)

This adds a new notifications datasource and associated migration to facilitate migration of the notification service from the Transaction Service to this project:

- Add new `00005_notifications` migration
- Add `NotificationsDatasource`:
  - `upsertSubscriptions`
  - `getSafeSubscription`
  - `getSubscribersWithTokensBySafe`
  - `deleteSubscription`
  - `deleteDevice`
- Add appropriate test coverage

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