feat: create buy script for solana tokens

utils/index.ts

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+export * from './utils';

utils/utils.ts

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+/**
+ * Runs the function `fn`
+ * and retries automatically if it fails.
+ *
+ * Tries max `1 + retries` times
+ * with `retryIntervalMs` milliseconds between retries.
+ *
+ * From https://mtsknn.fi/blog/js-retry-on-fail/
+ */
+export const retry = async <T>(
+  fn: () => Promise<T> | T,
+  { retries, retryIntervalMs }: { retries: number; retryIntervalMs: number },
+): Promise<T> => {
+  try {
+    return await fn();
+  } catch (error) {
+    if (retries <= 0) {
+      throw error;
+    }
+    await sleep(retryIntervalMs);
+    return retry(fn, { retries: retries - 1, retryIntervalMs });
+  }
+};
+
+export const sleep = (ms = 0) => new Promise((resolve) => setTimeout(resolve, ms));