Data-annotations length fix (dotnet#24101)

* Updated in MinLengthAttribute and MaxLengthAttribute to support ICollection<T>

* Added tests

* Fixed typo

* Trying to address two failing checks:
- Linux x64 Release Build
- UWP CoreCLR x64 Debug Build

* Implemented changes requested in review
- Extracted Count checking to an external helper to obey DRY
- Removed dependency of ICollection<T> and changed to simple reflection Count property lookup

* Added requested tests

* Added catch for MissingMetadataException.

* Extracted code from try-catch.

* Added comment as requested.

* Typo correction

src/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/MaxLengthAttribute.cs

@@ -122,12 +122,24 @@ public static bool TryGetCount(object value, out int count)
                 return true;
             }
 
-            PropertyInfo property = value.GetType().GetRuntimeProperty("Count");
+            PropertyInfo property = null;
+            try
+            {
+                // On CoreRT, this property may not be enabled for reflection.
+                // It may be possible to eliminate the exception by using direct reflection
+                // (i.e. not via the RuntimeReflectionExtensions or the new split TypeInfo format.
+                property = value.GetType().GetRuntimeProperty("Count");
+            }
+            catch (TypeAccessException)
+            {
+            }
+
             if (property != null && property.CanRead && property.PropertyType == typeof(int))
             {
                 count = (int)property.GetValue(value);
                 return true;
             }
+
             count = -1;
             return false;
         }