feat: ASAP-415 Add Working-Group Public API endpoint

[peterstarling]

• add new public endpoints
• add publish date and version to the responses

Notes

• we dont need pagination here really as the amount of working groups is so insignificant it was never implemented in our endpoints either - I think we can send it to GMMB as is but let me know what you think

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.43%. Comparing base (8636694) to head (2109a8d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4266   +/-   ##
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  Coverage   99.43%   99.43%           
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  Files         998      999    +1     
  Lines       18163    18183   +20     
  Branches     5671     5674    +3     
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+ Hits        18061    18081   +20     
  Misses        102      102           

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[gabiayako]

Hey, I think we need more data on members, don't we?

It's listed in ticket

• degree
• role
• dept
• institution
• city
• country

and in the website (https://gp2.org/working-group-directory/) passed as reference we have

so these info seems to be used

[peterstarling]

as per our discussion - we decided to leave these out and GMMB don't seem to need any extra information embedded for the nested resources