[Security] Implement certificate pinning

Description

The Google Play Store implements certificate pinning for all connections to Google. This should be done in Aurora Store for all connections to Google.

Examples

• https://github.com/GrapheneOS/Auditor/blob/main/app/src/main/res/xml/network_security_config.xml
• https://developer.android.com/training/articles/security-config#CertificatePinning

Additional context

This is an important security feature.