Add section to show the active AWS profile

[matchai]

Description

Implement AWS profile section based on the implementation on spaceship.

• Show profile name when it exists and isn't set to "default"
• Write tests for the new section
  • Clean up a whole lot of other tests
• Update documentation with the new section

Motivation and Context

Closes #85

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 not work as expected)

Screenshots (if appropriate):

How Has This Been Tested?

• [x] I have tested using MacOS
• [ ] I have tested using Linux

Checklist:

• [x] I have checked that no other PR duplicates mine
• [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 updated the tests accordingly.

[madsem]

Ahhh, it doesn't show when it's set to default, I was wondering why it's not working for me :) Maybe a good idea to also show it when it's set to default, why not? That way you know you're on default, can be helpful.

[matchai]

The feature is implemented as is because spacefish is a port of spaceship-prompt. If you feel like this should behave differently, please open an issue there. Once this feature is updated on spaceship, we will port the functionality back to spacefish. 🙂