feat(emr): add cos_bucket parameter for StarRocks shared-data cluster

[westzhao]

What this PR does

Add cos_bucket parameter to tencentcloud_emr_cluster resource to support creating StarRocks shared-data (存算分离) clusters.

Why is this needed

When creating StarRocks shared-data clusters via EMR API, the CosBucket parameter is required to specify the COS storage path. Without this parameter, users cannot create StarRocks shared-data clusters using Terraform.

Error before this fix:

Error: [TencentCloudSDKError] Code=InvalidParameter.InvalidCosBucket,
Message=CosBucket should be a valid value while creating a shared-data StarRocks cluster

Changes

• tencentcloud/services/emr/resource_tc_emr_cluster.go: Add cos_bucket schema definition
• tencentcloud/services/emr/service_tencentcloud_emr.go: Add cos_bucket parameter handling in CreateInstance
• website/docs/r/emr_cluster.html.markdown: Add documentation for cos_bucket parameter

Usage Example

resource "tencentcloud_emr_cluster" "starrocks_shared_data" {
  product_id    = 70  # STARROCKS-V2.2.1
  scene_name    = "StarRocks-Shared-Data"
  instance_name = "starrocks-shared-data-cluster"

  cos_bucket = "cos-bucket-name"

  softwares    = ["starrocks-3.3.13", "knox-1.2.0"]
  support_ha   = 0

  vpc_settings = {
    vpc_id    = "vpc-xxxxx"
    subnet_id = "subnet-xxxxx"
  }

  resource_spec {
    master_resource_spec {
      mem_size     = 16384
      cpu          = 4
      disk_size    = 100
      disk_type    = "CLOUD_SSD"
      spec         = "CVM.S5.MEDIUM8"
      storage_type = 5
    }
    master_count = 1
    task_count   = 3
    task_resource_spec {
      mem_size     = 16384
      cpu          = 4
      disk_size    = 0
      disk_type    = "CLOUD_SSD"
      spec         = "CVM.S5.MEDIUM8"
      storage_type = 5
    }
  }
  # ... other config
}

Testing

• Tested creating StarRocks shared-data cluster with cos_bucket parameter
• Verified API request includes CosBucket field

References

• EMR CreateInstance API
• Tencentcloud EMR StarRocks shared data

[westzhao]