Support account ID / names as profile names

[nimrodkor]

Support AWS account IDs or aliases as profile names

Description

In many orgs (like mine) we use a single role in multiple accounts.

Related Issue

Resolves #293

Motivation and Context

We have a lot of AWS accounts, and their names are long enough - using the roles makes it hard to use the cli with the resulting credentials.

How Has This Been Tested?

Added UT

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[tiagomatic]

Hey there. Thanks for adding this functionality! Are there any plans on merging this soon? My organization could use this to make things simpler.