fix(csharp/src/Apache.Arrow.Adbc/C): export statement_execute_schema …

…correctly (apache#2409)

Fix a minor typo,

I think we accidentally forgot to export the `statement_execute_schema`
handler from the C# exporter. And mistook StatementGetParameterSchema
for it, as they two looked so alike to each other...

so, this should restore it, please kindly approve.

csharp/src/Apache.Arrow.Adbc/C/CAdbcDriverExporter.cs

@@ -127,12 +127,13 @@ public unsafe static AdbcStatusCode AdbcDriverInit(int version, CAdbcDriver* nat
             nativeDriver->StatementBindStream = StatementBindStreamPtr;
             nativeDriver->StatementExecuteQuery = StatementExecuteQueryPtr;
             nativeDriver->StatementExecutePartitions = StatementExecutePartitionsPtr;
-            nativeDriver->StatementGetParameterSchema = StatementGetParameterSchemaPtr;
+            nativeDriver->StatementExecuteSchema = StatementExecuteSchemaPtr;
             nativeDriver->StatementNew = StatementNewPtr;
             nativeDriver->StatementPrepare = StatementPreparePtr;
             nativeDriver->StatementRelease = StatementReleasePtr;
             nativeDriver->StatementSetSqlQuery = StatementSetSqlQueryPtr;
             nativeDriver->StatementSetSubstraitPlan = StatementSetSubstraitPlanPtr;
+            nativeDriver->StatementGetParameterSchema = StatementGetParameterSchemaPtr;
 
             return 0;
         }