Feature request: query_account() should return pub_key alongside account_number and sequence

[mperklin]

Prerequisites

• [X] I checked the documentation and made sure this feature does not already exist.
• [X] I checked the existing issues to make sure this feature has not already been requested.
• [X] I have read the code of conduct before creating this issue.

Problem

There are cases where the user of cosmpy needs to retrieve the public key of an address from a cosmos blockchain daemon.

To enable this, cosmos blockchain daemons have the /cosmos/auth/v1beta1/accounts/cosmos1yaddayaddayadda query which retrieves the pub_key, account_number, and sequence values of the specified account.

Unfortunately, the aerial client's query_account function only returns the account_number and sequence values and does not return the pub_key.

Feature / Solution

A solution is to alter the query_account function to return the pub_key value that it is already retrieving from the server instead of discarding it.

Alternatives

At the moment, the only alternative I can find for a cosmpy dev to retrieve pub_keys from Cosmos daemons is to do it outside of cosmpy and use direct comms with the daemons instead.

Additional Context

The current implementation of query_account returns an instance of Account() which does not have the pub_key field defined.

A proper solution would require either one of the following to accomplish the goal:

1. Altering the existing Account() definition to make a pub_key field available
2. Creating a definition of a new data structure that has all fields returned from the /cosmos/auth/v1beta1/accounts/{account} call