feat: add schema-mariadb.sql file (#4524)

#### What type of PR is this?
/kind feature

#### What this PR does / why we need it:
spring.sql.init.platform 增加 mariadb 参数支持
适配 1Panel 安装 halo 时 选择 mariadb


```release-note
None
```

application/src/main/resources/schema-mariadb.sql

@@ -0,0 +1,7 @@
+create table if not exists extensions
+(
+    name    varchar(255) not null,
+    data    longblob,
+    version bigint,
+    primary key (name)
+);