Feat : Add push notification on onchain transaction receive

[heyolaniran]

🧪 Testing Coverage

• Unit Tests: Describe tested components or logic
• Integration Tests: State management or system interaction
• Manual Testing: End-to-end user journey or QA notes

Hello @islandbitcoin @brh28

This PR improves the handling of on-chain payment notifications received via Ibex webhooks and closes #120

thanks for having time to review the work and let me know if I should fix something about it.

[brh28]

@heyolaniran You have this marked as end-to-end tested, but I am curious how much of it you tested. I would be surprised/impressed if you were able to receive a push notification via firebase, especially if triggered by a real on-chain payment.

@islandbitcoin Let me know how you want to proceed with this.

[heyolaniran]

hello @brh28 sorry for this, certainly a mistake by my side while I was deleting the default pull request format. I was just able to run the unit and integration test. It is unchecked for the moment.