新增：获取单个提交的blame信息接口以及文档

app/views/api/v1/projects/commits/diff.json.jbuilder

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+json.file_nums @result_object['NumFiles']
+json.total_addition @result_object['TotalAddition']
+json.total_deletion @result_object['TotalAddition']
+json.files @result_object['Files'].each do |file|
+  json.name file['Name']
+  json.oldname file['OldName']
+  json.addition file['Addition']
+  json.deletion file['Deletion']
+  json.type file['Type']
+  json.is_created file['IsCreated']
+  json.is_deleted file['IsDeleted']
+  json.is_bin file['IsBin']
+  json.is_lfs_file file['IsLFSFile']
+  json.is_renamed file['IsRenamed']
+  json.is_ambiguous file['IsAmbiguous']
+  json.is_submodule file['IsSubmodule']
+  json.sections file['Sections'] do |section|
+    json.file_name section['FileName']
+    json.name section['Name']
+    json.lines section['Lines'] do |line|
+      json.left_index line['LeftIdx']
+      json.right_index line['RightIdx']
+      json.match line['Match']
+      json.type line['Type']
+      json.content line['Content']
+      unless line['SectionInfo'].blank?
+        json.section_path line['SectionInfo']['Path']
+        json.section_last_left_index line['SectionInfo']['LastLeftIdx']
+        json.section_last_right_index line['SectionInfo']['LastRightIdx']
+        json.section_left_index line['SectionInfo']['LeftIdx']
+        json.section_right_index line['SectionInfo']['RightIdx']
+        json.section_left_hunk_size line['SectionInfo']['LeftHunkSize']
+        json.section_right_hunk_size line['SectionInfo']['RightHunkSize']
+      end
+    end
+  end
+  json.is_incomplete file['IsIncomplete']
+  json.is_incomplete_line_too_long file['IsIncompleteLineTooLong']
+  json.is_protected file['IsProtected']
+end