Add the proxy-mode stateless test

[BohuTANG]

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Summary

Part of #3740

1. change USE TENANT to SUDO USE TENANT since mysql driver will handle the USE statement to USE 'TENANT xx' as use database
2. Add proxy-mode stateless test
3. Refine the test suites directory structure

Changelog

• Improvement

Related Issues

Part of #3740

Test Plan

Unit Tests

Stateless Tests

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[sundy-li]

sudo use tenent is a little hacky.

How about improving it by set tenent 'xxx' .

[BohuTANG]

sudo use tenent is a little hacky.

How about improving it by set tenent 'xxx' .

sudo use tenant is a administration command and only used in proxy mode(not for user), it mainly for a client to send commands to metasrv, not a user command.
Though, we should sperate it from the user command.

[BohuTANG]

This only for proxy-mode and re-struct some stateless, let's merge