[Feature] 希望增加个lib生成 方便集成项目中减少编译

[meng-plus]

Describe problem solved by the proposed feature

源码越来越多，增加个lib功能 ，用户只调用接口不再操心rtos的配置 专心做应用，减少编译耗时

Describe your preferred solution

No response

Describe possible alternatives

No response

[BernardXiong]

scons --buildlib=xxx