新增：根据项目id查询数据集接口

app/views/api/v1/project_datasets/index.json.jbuilder

@@ -0,0 +1,14 @@
+json.total_count @project_datasets.total_count
+json.project_datasets @project_datasets.each do |dataset|
+  json.(dataset, :id, :title, :description, :paper_content)
+  json.project do 
+    json.partial! "api/v1/projects/simple_detail", project: dataset.project
+  end
+  if dataset.license.present? 
+    json.license do 
+      json.(dataset.license, :name, :content)
+    end
+  else
+    json.license nil 
+  end
+end

app/views/api/v1/projects/_simple_detail.json.jbuilder

@@ -1,7 +1,7 @@
 if project.present?
   json.type project.project_type
   json.(project, 
-    :description, :forked_count, :forked_from_project_id, :identifier, 
+    :id, :description, :forked_count, :forked_from_project_id, :identifier, 
     :issues_count, :pull_requests_count, :invite_code, :website, :platform,
     :name, :open_devops, :praises_count, :is_public, :status, :watchers_count,
     :ignore_id, :license_id, :project_category_id, :project_language_id)