Added 'profile_updated' to contact_info & member to version profile info

[mpretty-cyro]

There is currently a bug in Session where profile information can be overwritten with stale information, this is due to profile information contained within a message not containing any version information - a single scenario which results in this bug is:

• Create two accounts (Alice and Bob)
• Start a 1-to-1 conversation between them
• Create a group with both accounts
• Have both accounts send messages in both conversations
• Have Alice update their profile information and send new messages into the 1-to-1 conversation
• Have Bob restore their account on a new device

In the above scenario Bob will have downloaded and processed all 1-to-1 messages before receiving the group messages, once the group messages are processed their profile data will incorrectly overwrite the newer information that was attached to the 1-to-1 messages

The solution for this is to include a profile_updated timestamp alongside the profile information when sending a message - the client can then compare this against their cached information in order to determine whether they should update the cache

Since libSession stores profile information for contacts and group members it also needs to track this value which is the purpose of this PR