Show AWS config info when using \status

[guyilin-amazon]

For the \status command, currently it will print current region, ledger and version:

Region: us-west-2, Ledger: test-ledger, Shell version: 2.0.0-alpha14

It would be more helpful to also print the current AWS credentials or profile the Shell is using, like the aws configure list command:

❯ aws configure list
      Name                    Value             Type    Location
      ----                    -----             ----    --------
   profile                <not set>             None    None
access_key     ****************X6VS shared-credentials-file
secret_key     ****************srna shared-credentials-file
    region                us-west-2      config-file    ~/.aws/config