chore: implement oom/ood processing component (#16436)

Implements the processing logic as set out in the OOM/OOD RFC.

coderd/util/slice/slice.go

@@ -177,3 +177,19 @@ func DifferenceFunc[T any](a []T, b []T, equal func(a, b T) bool) []T {
 	}
 	return tmp
 }
+
+func CountConsecutive[T comparable](needle T, haystack ...T) int {
+	maxLength := 0
+	curLength := 0
+
+	for _, v := range haystack {
+		if v == needle {
+			curLength++
+		} else {
+			maxLength = max(maxLength, curLength)
+			curLength = 0
+		}
+	}
+
+	return max(maxLength, curLength)
+}