[Hint] Post-output hint

[jiasli]

Description

This PR requires

• [Event] Add EVENT_CLI_SUCCESSFUL_EXECUTE microsoft/knack#224
• Add raw_result to CommandResultItem microsoft/knack#235
• {Style} Support style with color #16220
• {Style} Refine style framework #16258

Add experimental post-output hint which is shown after a command succeeds (except for az --version which follows a different code path).

Testing Guide

Currently, only az login and az demo hint is registered with hinters:

> az demo hint
This command is implicitly deprecated because command group 'demo' is deprecated and will be removed in a future release.
{
  "cloudName": "AzureCloud",
  "homeTenantId": "54826b22-38d6-4fb2-bad9-b7b93a3e9c5a",
  "id": "0b1f6471-1bf0-4dda-aec3-cb9272f09590",
  "isDefault": true,
  "managedByTenants": [
    {
      "tenantId": "2f4a9838-26b7-47ee-be60-ccc1fdec5953"
    }
  ],
  "name": "AzureSDKTest",
  "state": "Enabled",
  "tenantId": "54826b22-38d6-4fb2-bad9-b7b93a3e9c5a",
  "user": {
    "name": "[email protected]",
    "type": "user"
  }
}
The hinter can parse the output to show a "projection" of the output, like

       Subscription name: AzureSDKTest
         Subscription ID: 0b1f6471-1bf0-4dda-aec3-cb9272f09590
                    User: [email protected]

You may then instruct the user to run additional commands:

az account set <X>            Set your default subscription account
az config set output=table    Set your default output to be in table format
az feedback                   File us your latest issue encountered
az next                       Get some ideas on next steps
az upgrade                    Set your default subscription account

You may also show a hyperlink for more detail: https://docs.microsoft.com/cli/azure/

History Notes

[Hint] az login: Add experimental post-output hint

[yonzhan]

LGTM

[chenlomis]

Very cool!
To confirm, some of the text and output under def login_hinters are still in discussion right?
This is just to review that post output hint is now supported under login and also the demo command ..(?)

[jiasli]

/azp run

[azure-pipelines]

Pull request contains merge conflicts.