add fsm config load

[Yunxe]

What this PR does / why we need it:
add fsm config load to deviceshifubase && complete relative unit test
Will this PR make the community happier?
yes
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

How is this PR tested

• unit test
• e2e test
• other (please specify)

Special notes for your reviewer:

Release note:

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: +0.11% 🎉

Comparison is base (ae036da) 54.76% compared to head (6351879) 54.88%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
+ Coverage   54.76%   54.88%   +0.11%     
==========================================
  Files          23       23              
  Lines        2277     2283       +6     
==========================================
+ Hits         1247     1253       +6     
  Misses        914      914              
  Partials      116      116              

Files Changed	Coverage Δ
pkg/deviceshifu/deviceshifubase/deviceshifubase.go	57.93% <ø> (ø)
...iceshifu/deviceshifubase/deviceshifubase_config.go	65.16% <33.33%> (-1.12%)	⬇️

... and 1 file with indirect coverage changes

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[BtXin]

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