feat(kafka_instance): support multiple security groups

[Gezi-lzq]

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[Copilot]

Pull request overview

This pull request adds support for multiple security groups in the Kafka instance resource at the compute_specs level. The change migrates from a singular security group API field to a plural security groups field that accepts a list of security group IDs.

Changes:

• Updated client models to use SecurityGroups []string instead of SecurityGroup *string in API structs
• Added security_groups list attribute to compute_specs in both resource and datasource schemas
• Implemented expansion and flattening logic with proper null/unknown handling
• Added comprehensive test coverage for validation, expansion, and flattening scenarios

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
client/model_kafka_instance.go	Changed API field from singular SecurityGroup (*string) to plural SecurityGroups ([]string) across SpecificationParam, SpecificationVO, and SpecificationUpdateParam
internal/provider/resource_instance.go	Added security_groups list attribute to compute_specs schema with validation requiring at least 1 item and replacement plan modifier
internal/provider/datasource_instance.go	Added computed security_groups list attribute to datasource schema
internal/models/kafka_instance.go	Added SecurityGroups field to ComputeSpecsModel, implemented expansion and flattening logic with proper null/unknown state handling
internal/models/kafka_instance_test.go	Added comprehensive tests for expanding and flattening security_groups with multiple scenarios (null, single, multiple values)
internal/provider/resource_instance_validation_test.go	Added test for compute_specs security_groups validator ensuring empty lists are rejected and non-empty lists are accepted
examples/resources/automq_kafka_instance/resource.tf	Added commented example showing optional security_groups usage
docs/resources/kafka_instance.md	Added security_groups documentation to compute_specs attributes
docs/data-sources/kafka_instance.md	Added security_groups documentation to compute_specs read-only attributes

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