Add an empty `procs_priv` table for compatibility

## Feature Request

**Is your feature request related to a problem? Please describe:**

On the **Privileges** page of phpmyadmin, it will query the `tables_priv` table and the `procs_priv` at the same time.

But unfortunately, TiDB doesn't support stored procedure and stored function (related issue: https://github.com/pingcap/tidb/issues/17524), so it doesn't has the`procs_priv` table.

The user of phpmyadmin cannot access the **Privileges** page due to the `Table 'mysql.procs_priv' doesn't exist` error:


**Describe the feature you'd like:**

Add a `procs_priv` table like mysql:

https://dev.mysql.com/doc/refman/8.0/en/grant-tables.html#grant-tables-procs-priv

Since TiDB do not support stored procedures, this can be an empty table.

**Describe alternatives you've considered:**

Fixed on the phpmyadmin side. But I am not sure if there are another database management tool has same problem.

**Teachability, Documentation, Adoption, Migration Strategy:**