sftp 能否加上进入目录和返回上级目录，远端和本地同步切换

## Please check known issues first

https://github.com/electerm/electerm/wiki/Know-issues

## Electerm version:

## Operating system(linux, macos, or windows7/8/10?):

## Expected Behavior

## Can you reproduce the same behavior in other terminal:

## Current Behavior

## Possible Solution

## Steps to Reproduce

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## Context (Environment)

## Detailed Description

## Suggestions?

sftp 能否加上进入目录和返回上级目录，远端和本地同步切换，现在需要两边点，比较麻烦，谢谢