Handle PGP Key Feature for Channels module in Mobile App

[meKushdeepSingh]

Description

Currently, when a user subscribes to a channel, the signer approval prompt appears for each request. To improve the user experience, the system should allow the user to unlock their profile once and perform subsequent channel actions without needing repeated approval.

Acceptance Criteria:

• The user should only need to approve the signer once when subscribing to a channel.
• After unlocking their profile, the user should be able to perform direct channel actions without additional approval prompts.
• Maintain a smooth and seamless user experience while implementing this change.

Reference feature from DApp