[New Stmt] Support setting replica status manually (#1522)

Sometimes a replica is broken on BE, but FE does not notice that.
In this case, we have to manually delete that replica on BE.
If there are hundreds of replicas need to be handled, this is a disaster.

So I add a new stmt:

    ADMIN SET REPLICA STATUS

which support setting tablet on specified BE as BAD or OK.

docs/documentation/cn/sql-reference/sql-statements/Administration/ADMIN SET REPLICA STATUS.md

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+
+# ADMIN SET REPLICA STATUS
+## description
+
+    该语句用于设置指定副本的状态。
+    该命令目前仅用于手动将某些副本状态设置为 BAD 或 OK，从而使得系统能够自动修复这些副本。
+
+    语法：
+
+        ADMIN SET REPLICA STATUS
+        PROPERTIES ("key" = "value", ...);
+
+        目前支持如下属性：
+        "tablet_id"：必需。指定一个 Tablet Id.
+        "backend_id"：必需。指定 Backend Id.
+        "status"：必需。指定状态。当前仅支持 "bad" 或 "ok"
+
+        如果指定的副本不存在，或状态已经是 bad，则会被忽略。
+
+    注意：
+
+        设置为 Bad 状态的副本可能立刻被删除，请谨慎操作。
+
+## example
+
+    1. 设置 tablet 10003 在 BE 10001 上的副本状态为 bad。
+
+        ADMIN SET REPLICA STATUS PROPERTIES("tablet_id" = "10003", "backend_id" = "10001", "status" = "bad");
+
+    2. 设置 tablet 10003 在 BE 10001 上的副本状态为 ok。
+
+        ADMIN SET REPLICA STATUS PROPERTIES("tablet_id" = "10003", "backend_id" = "10001", "status" = "ok");
+
+## keyword
+
+    ADMIN,SET,REPLICA,STATUS
+