fix: hmac-auth plugin spec compatibility with latest apisix

[Revolyssup]

The hmac-auth plugin in APISIX had gone through a rewrite/refactor due to which it's incompatible with current version of ingress controller. This PR makes it compatible with apache/apisix#11581

Now if users want to configure these fields, they will have to use PluginConfig resource with ApisixRoute aur the plugins field.

Key changes:

• Other than key_id and secret_key all fields deprecated from consumer configuration.
• access_key added along with key_id. One of these will have to be passed
• The older configuration will still be supported.
• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[AlinsRan]

This change introduces a breaking change.
When using older versions of the data plane, this API still applies.
Instead of removing the existing field directly, we should mark it as deprecated and clearly document the incompatibility, so that users have a migration path. Meanwhile, we can introduce the new field to support the latest data plane.

[ronething]

lgtm