[armstrong-numbers] Two new test cases (#2080)

* [armstrong-numbers] Two new test cases

Someone look over my shoulder... first use of configlet. :)

Please see: exercism/raku#540 (comment)

* Add warning comment about numeric sizes

* Adjust comments field to an array

* Removed trailing spaces and colons

* Added big-integers scenario and whitespace linting

* Change scenarios from plural to singular

* Remove whitespace around scenarios

Author: habere-et-dispertire

exercises/armstrong-numbers/canonical-data.json

@@ -81,6 +81,32 @@
         "number": 9926314
       },
       "expected": false
+    },
+    {
+      "uuid": "5ee2fdf8-334e-4a46-bb8d-e5c19c02c148",
+      "description": "Armstrong number containing seven zeroes",
+      "comments": [
+        "The numeric size of this input number is 108 bits. Consider skipping this test if appropriate."
+      ],
+      "scenarios": ["big-integer"],
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 186709961001538790100634132976990
+      },
+      "expected": true
+    },
+    {
+      "uuid": "12ffbf10-307a-434e-b4ad-c925680e1dd4",
+      "description": "The largest and last Armstrong number",
+      "comments": [
+        "The numeric size of this input number is 127 bits. Consider skipping this test if appropriate."
+      ],
+      "scenarios": ["big-integer"],
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 115132219018763992565095597973971522401
+      },
+      "expected": true
     }
   ]
 }