chore: allow using static connection info in Connector

#406
added support for static connection info. But
5d9c473
accidentally deleted actually using the static connection info to create
the cache. So re-adding that change in this PR.

Author: rhatgadkar-goog

google/cloud/alloydbconnector/connector.py

@@ -37,6 +37,7 @@
 from google.cloud.alloydbconnector.instance import RefreshAheadCache
 from google.cloud.alloydbconnector.lazy import LazyRefreshCache
 import google.cloud.alloydbconnector.pg8000 as pg8000
+from google.cloud.alloydbconnector.static import StaticConnectionInfoCache
 from google.cloud.alloydbconnector.types import CacheTypes
 from google.cloud.alloydbconnector.utils import generate_keys
 from google.cloud.alloydbconnector.utils import strip_http_prefix
@@ -188,6 +189,8 @@ async def connect_async(self, instance_uri: str, driver: str, **kwargs: Any) ->
         # use existing connection info if possible
         if instance_uri in self._cache:
             cache = self._cache[instance_uri]
+        elif self._static_conn_info:
+            cache = StaticConnectionInfoCache(instance_uri, self._static_conn_info)
         else:
             if self._refresh_strategy == RefreshStrategy.LAZY:
                 logger.debug(