Refactor entire project (#39)

- Use more modern TypeScript conventions
- Use JavaScript Kubernetes Client
- Add unit tests
- Add integration tests
- Add TypeScript compile verify workflow
- Switch codeowners

src/types/method.ts

@@ -0,0 +1,17 @@
+export enum Method {
+  KUBECONFIG = "kubeconfig",
+  SERVICE_ACCOUNT = "service-account",
+  SERVICE_PRINCIPAL = "service-principal",
+}
+
+/**
+ * Converts a string to the Method enum
+ * @param str The method (case insensitive)
+ * @returns The Method enum or undefined if it can't be parsed
+ */
+export const parseMethod = (str: string): Method | undefined =>
+  Method[
+    Object.keys(Method).filter(
+      (k) => Method[k].toString().toLowerCase() === str.toLowerCase()
+    )[0] as keyof typeof Method
+  ];