Messenger : Read messages from many iteration of Smart contract

[gdaguin]

Is your feature request related to a problem?

No response

Describe the solution you'd like

Each time a discussion is modified (addition of members, change of admin, modification of group name, etc.), the discussion transaction chain evolves with updates to the smart contract.
This means that messages sent by users are received in the last address of the smart contract transaction chain.
So a smart contract at index 1 may have 4 messages as inputs, at index 2, 6 messages, etc....

Currently, only the inputs in the last address of the chain are read.

Describe the solution you'd like
The previous addresses must therefore be read to retrieve all the messages.

To avoid performance problems, use the limit property passed to the read method of the MessagesMixin mixin.
If the limit is not reached for the txContentMessagesAddresses list, then the inputs from the previous transaction are retrieved.

Additional context

No response

Epic

No response

[gdaguin]

Don't forget to test (in the wallet, messenger_repo => getMessages) when an user leaves a discussion => retrieve old messages