feat!: Initial v2 commit

* Implemented editorconfig
* Switched to ESM
* Switched to a TypeScript workflow
* Switched to projen for project management
* Major code refactor
* TODO: need tests

dist/cleanup/index.d.ts

@@ -0,0 +1,11 @@
+/**
+ * When the GitHub Actions job is done, clean up any environment variables that
+ * may have been set by the configure-aws-credentials steps in the job.
+ *
+ * Environment variables are not intended to be shared across different jobs in
+ * the same GitHub Actions workflow: GitHub Actions documentation states that
+ * each job runs in a fresh instance.  However, doing our own cleanup will
+ * give us additional assurance that these environment variables are not shared
+ * with any other jobs.
+ */
+export declare function cleanup(): Promise<void>;