Add notice annotation level and support more annotation fields (#1175)

* Add Notice Command

* Add Feature Flag For Enhanced Annotations

* Fix tests

* Add validation for columns and lines

* Fix order to match service

* Remove console.write

* Make Validation Better

* Cleanup

* Handle empty/whitespace strings

* Add more validation for line/column ranges

* Make Validation Debug, Not Throw

* Change casing to 🐫 from 🐍

* Give notice a well known tag

* Cleanup

* Sanitize invalid commands rather than fail

src/Sdk/DTWebApi/WebApi/IssueType.cs

@@ -9,6 +9,9 @@ namespace GitHub.DistributedTask.WebApi
         Error = 1,
 
         [EnumMember]
-        Warning = 2
+        Warning = 2,
+
+        [EnumMember]
+        Notice = 3
     }
 }

src/Sdk/DTWebApi/WebApi/TimelineRecord.cs

@@ -38,6 +38,7 @@ namespace GitHub.DistributedTask.WebApi
             this.RefName = recordToBeCloned.RefName;
             this.ErrorCount = recordToBeCloned.ErrorCount;
             this.WarningCount = recordToBeCloned.WarningCount;
+            this.NoticeCount = recordToBeCloned.NoticeCount;
             this.AgentPlatform = recordToBeCloned.AgentPlatform;
 
             if (recordToBeCloned.Log != null)
@@ -222,6 +223,13 @@ namespace GitHub.DistributedTask.WebApi
             set;
         }
 
+        [DataMember(Order = 55)]
+        public Int32? NoticeCount
+        {
+            get;
+            set;
+        }
+
         public List<Issue> Issues
         {
             get