sim:nsh: Enable PIPES to make nsh pipeline available

[JianyuWang0623]

Summary

Enable PIPES to make nsh pipeline available.
More details, please see apache/nuttx-apps#2737

Impact

CLI of sim:nsh

Testing

1. Selftest

# Test 1 with `FS_HOSTFS`
nsh> ls / | dd of=/data/test_pipeline
sh [4:100]
nsh> cat /data/test_pipeline
/:
 bin/
 data/
 dev/
 etc/
 proc/
 tmp/
 var/
nsh> ls /
/:
 bin/
 data/
 dev/
 etc/
 proc/
 tmp/
 var/
nsh>


# Test 2 with CMDPARAMS
## Without https://github.com/apache/nuttx-apps/pull/2841 - bug
nsh> echo $var | cat
sh [4:100]

nsh>
## With https://github.com/apache/nuttx-apps/pull/2841
nsh> set var `uname`
nsh> echo $var
NuttX
nsh> echo $var | cat
sh [4:100]
NuttX
nsh>

3. NuttX CI