[FR] Approve usage of products in key apps

[peruzzof]

Is your feature request related to a problem? Please describe.
I am automating the renewal of app keys, per design our products are set as "private". This means that whenever I create a new key it is in the "pending" state and there is no existing way to approve it.

Describe the solution you'd like
Implement the new commands:
apigeecli apps keys product approve
apigeecli apps keys product revoke

It must receive the same arguments as the keys get, with the additional list of products to be approved.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
This is the result of the "keys get" command:

{
        "apiProducts": [
                {
                        "apiproduct": "***REDACTED***",
                        "status": "pending"
                }
        ],
        "consumerKey": "***REDACTED***",
        "consumerSecret": "***REDACTED***",
        "expiresAt": "1769081929988",
        "issuedAt": "1737545929988",
        "status": "approved"
}

The method to be used is https://cloud.google.com/apigee/docs/reference/apis/apigee/rest/v1/organizations.developers.apps.keys.apiproducts/updateDeveloperAppKeyApiProduct

[srinandan]

The proposed change is:

apigeecli apps keys manage --help                                                                         
Approve or revoke a developer app key

Usage:
  apigeecli apps keys manage [flags]

Flags:
  -x, --action string    Action to perform - revoke or approve (default "revoke")
  -h, --help             help for manage
  -k, --key string       Developer app consumer key
      --product string   Name of the API Product; If not set the action is performed on all the API Products

--product is optional. If set then the command applies to the product. If not set, then it applies to all products.

[ssvaidyanathan]

Fixed in v2.9.0