[HCP Vault Secrets] Print out Gateway Pool Resource ID for gateway commands

[averche]

🛠️ Description

Gateway Pool Resource ID is needed when creating new gateway integrations. This PR exposes the ID on create / read /list as well as writes it into the creds.json file.

🔗 Additional Link

🏗️ Local Testing

Create

> ./bin/hcp vs gateway-pools create foo --output-dir=gw                                      
Gateway Pool Name:          foo
Gateway Pool Resource Name: secrets/project/ad203a6b-b390-46a5-b9b7-98d192be2159/gateway-pool/foo
Gateway Pool Resource ID:   774e045f-60f7-4cd9-b550-470c41498553
Description:

> cat gw/creds.json
{
  "project_id": "ad203a6b-b390-46a5-b9b7-98d192be2159",
  "scheme": "service_principal_creds",
  "oauth": {
    "client_id": "...",
    "client_secret": "..."
  }
}

Read

> ./bin/hcp vs gateway-pools read foo
Gateway Pool Name   Gateway Pool Resource Name                                              Gateway Pool Resource ID               Integrations   Description
foo                 secrets/project/ad203a6b-b390-46a5-b9b7-98d192be2159/gateway-pool/foo   774e045f-60f7-4cd9-b550-470c41498553   []
                                                                                            

List

> ./bin/hcp vs gateway-pools list
Gateway Pool Name   Gateway Pool Resource Name                                              Gateway Pool Resource ID               Description
foo                 secrets/project/ad203a6b-b390-46a5-b9b7-98d192be2159/gateway-pool/foo   774e045f-60f7-4cd9-b550-470c41498553

👍 Checklist

• The PR has a descriptive title.
• Input validation updated
• Unit tests updated
• Documentation updated
• Major architecture changes have a corresponding RFC
• Tests added if applicable
• CHANGELOG entry added or label 'pr/no-changelog' added to PR

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