enhancement: support plugins in ApisixConsumer

[kayx23]

Summary

Please triage whether ApisixConsumer should support generic consumer-scoped plugins beyond authentication.

Current behavior

APISIX itself supports binding plugins to consumers, but ApisixConsumer currently exposes authParameter only and does not provide a general plugins field for additional consumer-scoped plugins.

From the current implementation:

• ApisixConsumerSpec only contains authParameter
• the translator only maps supported auth entries from authParameter into consumer plugins

As a result, consumer-level plugin use cases supported by APISIX cannot currently be expressed through ApisixConsumer.

Use cases affected

• attaching plugins such as limit-count or limit-req directly to a consumer
• managing consumer auth and other consumer-scoped plugin behavior in the same ApisixConsumer resource

Code context

• api/v2/apisixconsumer_types.go
• internal/adc/translator/apisixconsumer.go