chore: upgrade TypeScript target from ES2020 to ES2022

Node.js >=22 is required, so ES2022 features like Error cause,
top-level await, and Array.at() are safe to use. This also restores
the { cause: err } option in parseJsonField() that was previously
removed due to the old target.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: torosent

packages/durabletask-js/src/utils/pb-helper.util.ts

@@ -431,7 +431,7 @@ export function parseJsonField(v?: StringValue | null): any {
     return JSON.parse(v.getValue());
   } catch (err) {
     // Wrap JSON.parse errors to provide clearer context to callers while preserving the original error
-    throw new Error(`Failed to parse JSON from StringValue: ${(err as Error).message}`);
+    throw new Error(`Failed to parse JSON from StringValue: ${(err as Error).message}`, { cause: err });
   }
 }
 

tsconfig.base.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
+    "target": "ES2022",
+    "lib": ["ES2022"],
     "module": "commonjs",
     "declaration": true,
     "strict": true,