ICU-14484: redis connect helper (#6001)

* add redis connect support
* Setup redis in docker for e2e testing
* Update docs and changelog
* Commenting out e2e tests for now, will revisit in a separate task

website/data/docs-nav-data.json

@@ -1237,6 +1237,10 @@
             "title": "postgres",
             "path": "commands/connect/postgres"
           },
+          {
+            "title": "redis",
+            "path": "commands/connect/redis"
+          },
           {
             "title": "rdp",
             "path": "commands/connect/rdp"