feat(edgex): adapt to message v4

[ngjaying]

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[codecov]

Codecov Report

Attention: Patch coverage is 92.52336% with 8 lines in your changes missing coverage. Please review.

Project coverage is 71.41%. Comparing base (fa5645e) to head (568fd31).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/edgex/source.go	86.49%	4 Missing and 1 partial ⚠️
internal/io/edgex/sink.go	95.45%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3532      +/-   ##
==========================================
+ Coverage   71.08%   71.41%   +0.33%     
==========================================
  Files         416      415       -1     
  Lines       48006    47974      -32     
==========================================
+ Hits        34122    34259     +137     
+ Misses      11214    11038     -176     
- Partials     2670     2677       +7     

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[ngjaying]

Fixes #3534 #3528