Restore the JobState class

[MrCreosote]

Was removed in version 0.1.0 6 years ago, but is still used in kb_sdk Java async clients. Oops

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.

Project coverage is 39.10%. Comparing base (13738b6) to head (f112462).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rc/main/java/us/kbase/common/service/JobState.java	0.00%	18 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #69      +/-   ##
=============================================
- Coverage      39.34%   39.10%   -0.24%     
  Complexity       333      333              
=============================================
  Files             30       31       +1     
  Lines           2956     2974      +18     
  Branches         516      516              
=============================================
  Hits            1163     1163              
- Misses          1646     1664      +18     
  Partials         147      147              

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