!499 逻辑复制时，增大逻辑复制插件的选项长度限制。

Merge pull request !499 from 吕辉/increased_length_limit_for_logical_replication_plugin

src/gausskernel/storage/replication/walsender.cpp

@@ -1664,7 +1664,7 @@ bool cmdStringCheck(const char* cmd_string)
  */
 static bool cmdStringLengthCheck(const char* cmd_string)
 {
-    const size_t cmd_length_limit = 200;
+    const size_t cmd_length_limit = 20000;
     const size_t slotname_limit = 64;
     char comd[cmd_length_limit] = {'\0'};
     char* sub_cmd = NULL;