Add lib/random.claro from Claro v1.17.26 zip

lib/random.claro

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+# Claro Standard Library: random
+# Use: IMPORT "lib/random.claro" AS random
+EXPORT ALL
+
+TEACH seed TAKES n
+    SEED n
+    RETURN YES
+LEARNED
+
+TEACH float TAKES none
+    RAND AS r
+    RETURN r
+LEARNED
+
+TEACH int TAKES lo, hi
+    RAND FROM lo TO hi AS r
+    RETURN r
+LEARNED