[POC] User to public keys mapping union - cosmos SDK

[Max-Levitskiy]

We need to solve a problem where our user authorizes from different devices with different keys and we work with him as with the same user.
Cosmos SDK has key-value storage, which we can use to store this information in a decentralized way.
We want to have a couple of methods:

• register(publicKey) UUID - add the public key as a new user, generates uuid and return it.
• resolveByUuid(userUUID) UserInfo {[]publicKeys....}
• resolveByPublicKey(key) UserInfo .....
• addNewKey(newKey) - add a key to user
• getMyInfo() UserInfo