Added logs to display catalog backend(etcd/sqlite) and timeout for etcd.

[subkanthi]

closes: #166

Catalog backend: SQLite (jdbc:sqlite:file:data/ice-rest-catalog/db.sqlite?journal_mode=WAL&synchronous=OFF&journal_size_limit=500); not recommended for production use

2026-05-12 12:49:31 [main/97818] ERROR c.a.ice.rest.catalog.Main > Fatal
org.apache.iceberg.exceptions.RuntimeIOException: java.io.IOException: Failed to connect to etcd at http://localhost:2379: timed out after 30s
        at com.altinity.ice.rest.catalog.internal.etcd.EtcdCatalog.<init>(EtcdCatalog.java:91)
        at com.altinity.ice.rest.catalog.Main.newEctdCatalog(Main.java:618)
        at com.altinity.ice.rest.catalog.Main.loadCatalog(Main.java:536)
        at com.altinity.ice.rest.catalog.Main.call(Main.java:446)
        at com.altinity.ice.rest.catalog.Main.call(Main.java:76)
        at com.altinity.ice.rest.catalog.Main.main(Main.java:629) [8 skipped]
Caused by: java.io.IOException: Failed to connect to etcd at http://localhost:2379: timed out after 30s
        ... 14 common frames omitted
Caused by: java.util.concurrent.TimeoutException: null
        at com.altinity.ice.rest.catalog.internal.etcd.EtcdCatalog.<init>(EtcdCatalog.java:88) [2 skipped]
        at com.altinity.ice.rest.catalog.Main.newEctdCatalog(Main.java:618)
        at com.altinity.ice.rest.catalog.Main.loadCatalog(Main.java:536)
        ... 13 common frames omitted