feat: As a user, I want to add support for consumer description

[jorgenll]

Description

Add support for define the AsipixConsumer description on the CRD and propagate this information to the Consumer synchronized on APISIX.

I need to define the description of the consumer but the CRD don't support it. I've try to use a label as alternative but the Kubernetes spec don't allow whitespaces on labels.

[jorgenll]

@Revolyssup, @AlinsRan, any feedback on this issue? Thanks!

[github-actions]

This issue has been marked as stale due to 90 days of inactivity. It will be closed in 30 days if no further activity occurs. If this issue is still relevant, please simply write any comment. Even if closed, you can still revive the issue at any time or discuss it on the dev@apisix.apache.org list. Thank you for your contributions.

[jorgenll]

Waiting review of @AlinsRan

[jorgenll]

Hi. Any comment about the issue and the linked pull request? @AlinsRan , @Revolyssup