Cache user address for querying accounts

[fedekunze]

Description:

we should cache the user.address to query the account balance, delegations, transactions, etc as stated in #1638

Note that it's different from the wallet.address as the first can change for different address look up (See #1719), while the 2 is the ledger/ keystore address for signing txs

[faboweb]

Note that it's different from the wallet.address as the first can change for different address look up (See #1719), while the 2 is the ledger/ keystore address for signing txs

we need to redesign transaction lookup. wallet.address will probably not be used when we implement this.

[fedekunze]

we use it to send txs (eg: from ledger.pubKey() get the account address and set it to wallet.address)

[faboweb]

wallet.address should probably not be used for sending either but user.address as a single source of truth for the session a user is logged in with.