增加task provider功能

[ZZH-Finalize]

Is your feature request related to a problem? Please describe.

vscode有内置的task, 使用者可以把编译任务包装成task, 然后使用快捷键调用task, 或者task之间相互调用, 目前xmake没有提供"xmake"的task类型, 也不能根据xmake.lua生成task配置

Describe the solution you'd like

使用vscode的task provider机制实现, 就像cmake、meson、node等插件所做的那样

Describe alternatives you've considered

No response

Additional context

No response