fix(cmn): legacy metrics binds to 0.0.0.0 (#2620)

Updates legacy MetricsServer to bind to 0.0.0.0 instead of 127.0.0.1 by
default which makes it possible to expose the metrics server from inside
docker. Only the DTL is still using legacy metrics, so should be fine.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.changeset/cyan-ravens-swim.md

+---
+'@eth-optimism/common-ts': patch
+---
+
+Have legacy BaseService metrics bind to 0.0.0.0 by default

packages/common-ts/src/common/metrics.ts

@@ -56,7 +56,7 @@ export const createMetricsServer = async (
   })
 
   const port = options.port || 7300
-  const hostname = options.hostname || '127.0.0.1'
+  const hostname = options.hostname || '0.0.0.0'
   const server = app.listen(port, hostname, () => {
     logger.info('Metrics server started', {
       port,