[Feature]: 请增加mysql.tables_priv和proxies_priv表的支持 || [Feature]: Please add support for mysql.tables_priv and proxies_priv tables

[lenmore]

MySQL的mysql库有4张 *_priv表，OB目前只支持了其中两张。这导致了部分软件，特别是中间件软件在读取用户权限时失败，进而无法支持OB。比如maxscale

• [x] columns_priv
• [x] procs_priv
• [ ] proxies_priv
• [ ] tables_priv

请考虑增加mysql.tables_priv和proxies_priv表的支持。

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MySQL's mysql library has four *_priv tables, and OB currently only supports two of them. This causes some software, especially middleware software, to fail when reading user permissions, and thus cannot support OB. For example maxscale

• [x] columns_priv -[x]procs_priv
• [ ] proxies_priv
• [ ] tables_priv

Please consider adding support for mysql.tables_priv and proxies_priv tables.