Implement Sequencer API component: mysql

[GimmeCyy]

What would you like to be added:
Add Sequencer API component: mysql #438

[seeflood]

Thanks for your help! Already assigned to u.

Reference:
组件开发指南
快速开始：使用Sequencer API生成分布式唯一、自增id
Sequencer API设计文档
组件配置说明

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue or help wanted) or other activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as pinned, good first issue or help wanted. Thank you for your contributions.

[seeflood]

action

• review and merge @seeflood