Rock supports Windows PowerShell, References #862

[yangzhao02]

1. Add supports for Windows powershell
2. Some Python packages that are not available on Windows have been bypassed.
3. test results
   3.1 add a file on Windows using rock

curl -X POST http://localhost:8000/write_file -H 'Content-Type: application/json' -d '{"path":"C:\\Users\\User\\Desktop\\hello.txt","content":"Hello from Rocklet on Windows!"}'

then we can see hello.txt on windows.

[CLAassistant]

All committers have signed the CLA.

[StephenRi]

搞个抽象类出来吧。别用这种方式

[StephenRi]

不然后续别的平台没法扩展了

[StephenRi]

比如BaseRocklet，LinuxRocklet，WindowsRocklet这样

[StephenRi]

WindowsRocklet里，主要实现PowerShellSession相关逻辑，import自己的包。