fix(agents): share runtimes across connection sessions

agents/drivers/access/src/main/java/com/dbx/agent/access/AccessAgent.java

@@ -8,7 +8,7 @@ import com.dbx.agent.ExecuteQueryOptions;
 import com.dbx.agent.ForeignKeyInfo;
 import com.dbx.agent.IndexInfo;
 import com.dbx.agent.JdbcExecutor;
-import com.dbx.agent.JsonRpcServer;
+import com.dbx.agent.MultiSessionJsonRpcServer;
 import com.dbx.agent.ObjectInfo;
 import com.dbx.agent.QueryResult;
 import com.dbx.agent.TableInfo;
@@ -217,7 +217,7 @@ public final class AccessAgent extends BaseDatabaseAgent {
 
     @Override
     public QueryResult executeQuery(String sql, String schema, ExecuteQueryOptions options) {
-        return JdbcExecutor.INSTANCE.execute(
+        return JdbcExecutor.current().execute(
             requireConnected(),
             sql,
             schema,
@@ -225,7 +225,7 @@ public final class AccessAgent extends BaseDatabaseAgent {
             options.getMaxRows(),
             options.getFetchSize(),
             options.getTimeoutSecs(),
-            JdbcExecutor.INSTANCE::defaultResultValue
+            JdbcExecutor.current()::defaultResultValue
         );
     }
 
@@ -367,6 +367,6 @@ public final class AccessAgent extends BaseDatabaseAgent {
     }
 
     public static void main(String[] args) {
-        new JsonRpcServer(new AccessAgent()).run();
+        new MultiSessionJsonRpcServer(AccessAgent::new).run();
     }
 }