[schema][algorithm] algorithm range params can only be numbers

Algorithm range parameters were previously able to be strings,
booleans, numbers, or a mix of those three.

beat/core/schema/algorithm/common.json

@@ -66,7 +66,7 @@
 
     "range": {
       "type": "array",
-      "items": { "$ref": "../common/1.json#/definitions/value" },
+      "items": "number",
       "minItems": 2,
       "maxItems": 2
     },