Resolving Licensing Conflicts in Apollo: Request for Community Input

## Background
Apollo is an open-source, distributed configuration center that operates under the Apache 2.0 license. Recently, we have identified some potential licensing conflicts in our project through the use of FOSSA, which warrant our attention.

For example, mysql-connector-j is under the GPL2 license. Though Apollo adheres to the GPL license since all its code is open source, users of Apollo may breach this license if they alter the code without subsequently making it open source.

## Current Situation
For instance, to deal with the mysql-connector-j issue, many other projects opt to only support PostgreSQL or H2SQL by default in their installation packages. If users need to utilize MySQL databases, they are required to manually copy the mysql-connector-j JAR file to their classpath and configure it accordingly. Unfortunately, Apollo's support for PostgreSQL and H2SQL is still a work in progress and, as such, this approach is not currently viable.

## Request for Community Input
As we explore potential solutions to this issue, we would like to involve our valuable community members in the process. Your input, suggestions, and experiences with similar situations can provide valuable insights that will help us make well-informed decisions moving forward.

Please consider sharing your thoughts and recommendations on how we can best address the licensing conflicts while maintaining the Apache 2.0 license for Apollo.

## 背景
Apollo 是一个采用 Apache 2.0 许可证的开源分布式配置中心。近期，我们通过 FOSSA 发现项目中有潜在的许可冲突问题，需要引起我们的重视。

例如 mysql-connector-j 采用的是 GPL 2 许可证，虽然 Apollo 没有违反 GPL 协议（因为所有代码都是开源的），但是如果 Apollo 的用户在修改代码后没有随之开源，他们可能会违反此许可证。

## 当前情况
例如，为了解决 mysql-connector-j 的问题，许多其他项目选择默认在安装包中仅支持 PostgreSQL 或 H2SQL。如果用户需要使用 MySQL 数据库，他们需要手动将 mysql-connector-j 的 JAR 文件复制到类路径并进行相应配置。遗憾的是，Apollo 对 PostgreSQL 和 H2SQL 的支持仍在进行中，因此目前尚不具备这个条件。

## 征求社区意见
在寻求解决这个问题的可能方案时，我们希望将我们的社区成员纳入其中。您的意见、建议以及在类似情况下的经验可以为我们提供宝贵的见解，帮助我们做出明智的决策。

请考虑分享您的想法和建议，以便我们在维护 Apollo 的 Apache 2.0 许可证的同时，最好地解决许可证冲突问题。