#232·Feature update for pRB v3 July 2023

This is a planned update for pRB v3, it includes:

• Fixes lifetime management for transations to reduce the occurance of BadSequence warning
• No more wraps single MQ message in batches
• Improves nonce management for transactions
• Updates subxt to the version used as in the main branch of phala-blockchain repo
• Merge prb package into the main branch

The milestone will be trackable as a pull request of the phala-blockchain repo:
https://github.com/Phala-Network/phala-blockchain/pull/1348