feat(iam): added user-report action to report on console access and api keys

[clok]

$ gw-aws-audit iam ur --help
NAME:
   gw-aws-audit iam user-report - generates report of IAM Users and Access Key Usage

USAGE:

This action will generate a report for all Users within an AWS account with the details
specific user authentication methods.

┌──────────────┬────────┬───────────┬─────────┬────────────┬─────────────────────────────────────────────────────────────────────────┐
│              │        │           │         │            │                           ACCESS KEY DETAILS                            │
│ USER         │ STATUS │       AGE │ CONSOLE │ LAST LOGIN │               KEY ID | STATUS | AGE | LAST USED | SERVICE               │
├──────────────┼────────┼───────────┼─────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤
│ user12345    │   PASS │  123 days │      NO │       NONE │                               0 API Keys                                │
├──────────────┼────────┼───────────┼─────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤
│ bot-user-123 │   WARN │  236 days │      NO │       NONE │                               2 API Keys                                │
│              │        │           │         │            │ AKIAIOSFODNN6EXAMPLE │ Active │ 229 days │   229 days 22 hours   │ s3   │
│              │        │           │         │            │ AKIAIOSFODNN5EXAMPLE │ Active │ 228 days │ 51 minutes 24 seconds │ sts  │
├──────────────┼────────┼───────────┼─────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤
│ userAOK123   │   FAIL │   43 days │     YES │     5 days │                               1 API Key                                 │
│              │        │           │         │            │   AKIAIOSFODNN3EXAMPLE │ Active │ 43 days │ 22 hours 5 minutes │ ec2    │
└──────────────┴────────┴───────────┴─────────┴────────────┴─────────────────────────────────────────────────────────────────────────┘

USER [string]:
  - The user name

STATUS [enum]:
  - PASS: When a does NOT have Console Access and has NO Access Keys
  - FAIL: When a User has Console Access
  - WARN: When a User does NOT have Console Acces, but does have at least 1 Access Key
  - UNKNOWN: Catch all for cases not handled.

AGE [duration]:
  - Time since User was created

CONSOLE [bool]:
  - Does the User have Console Access? YES/NO

LAST LOGIN [duration]:
  - Time since User was created
  - NONE if the User does not have Console Access or if the User has NEVER logged in.

ACCESS KEY DETAILS [sub table]:
  - Primary header row is the number of Access Keys associated with the User

  KEY ID [string]:
    - The AWS_ACCESS_KEY_ID

  STATUS [enum]:
    - Active/Inactive

  LAST USED [duration]:
    - Time since the Access Key was last used.

  SERVICE [string]:
    - The last AWS Service that the Access Key was used to access at the "LAST USED" time.


OPTIONS:
   --help, -h  show help (default: false)

[paulojblack]

I love that you're coupling the milestones of the security effort with utility features in this tool. Awesome stuff!