dtl: log error stack for failed http request (#995)

* dtl: log error stack for failed http request

* chore: add changeset

.changeset/slimy-rivers-promise.md

+---
+'@eth-optimism/data-transport-layer': patch
+---
+
+Logs the error stacktrace for a failed HTTP request

packages/data-transport-layer/src/services/server/service.ts

@@ -198,6 +198,7 @@ export class L1TransportServer extends BaseService<L1TransportServerOptions> {
           url: req.url,
           elapsed,
           msg: e.toString(),
+          stack: e.stack,
         })
         return res.status(400).json({
           error: e.toString(),