Add utility functions

src/cryptometrics/utils/index.js

+export * from "./utils";

src/cryptometrics/utils/utils.js

+export function less_than_number(a, b) {
+  return Number(a) < Number(b);
+}
+
+export function equals_integer(a, b) {
+  return parseInt(a) === parseInt(b);
+}
+
+export function greater_than_number(a, b) {
+  return Number(a) > Number(b);
+}
+
+export function equals_string(a, b) {
+  return a.toLowerCase() === b.toLowerCase();
+}
+
+export function contains_string(a, b) {
+  return a.toLowerCase().includes(b.toLowerCase());
+}