Tools - Add runner for sys info and update docs

[yukirora]

Description
Add runner for sys info to automatically collect on multiple nodes and update related docs.

Major Revision

• add runner for sys info which will check docker status and run sb node info on all nodes' docker and fetch results from all nodes

Minor Revision

• update cli and system-info doc
• update sb node info to save output info output-dir/sys-info.json

[codecov]

Codecov Report

Merging #532 (0efc70c) into main (3a6622f) will decrease coverage by 0.14%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #532      +/-   ##
==========================================
- Coverage   87.11%   86.97%   -0.14%     
==========================================
  Files          89       89              
  Lines        5985     6006      +21     
==========================================
+ Hits         5214     5224      +10     
- Misses        771      782      +11     

Flag	Coverage Δ
cpu-python3.6-unit-test	73.31% <50.00%> (-0.10%)	⬇️
cpu-python3.8-unit-test	73.78% <50.00%> (-0.10%)	⬇️
cuda-unit-test	86.86% <50.00%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superbench/cli/_help.py	100.00% <ø> (ø)
superbench/runner/runner.py	82.46% <9.09%> (-4.04%)	⬇️
superbench/cli/_handler.py	91.54% <50.00%> (-1.21%)	⬇️
superbench/cli/_commands.py	100.00% <100.00%> (ø)
superbench/cli/_node_handler.py	86.66% <100.00%> (+11.66%)	⬆️