feature: OSIS-88 getAnonymousUser

[XinLi0207]

this API is needed for OSE healthcheck route /api/v1/core
after implementing this API, now the response of https://192.168.198.12/api/v1/core is like:

{
    "name": "Cloud Director Object Storage Extension",
    "description": "Object Storage Extension for VMware Cloud Director",
    "version": "2.1.1-19362139",
    "buildDate": "2022-02-15T10:24:38.725+00:00"
}

[codecov]

Codecov Report

Merging #105 (0cb264f) into main (21632c1) will increase coverage by 0.09%.
The diff coverage is 76.47%.

@@             Coverage Diff              @@
##               main     #105      +/-   ##
============================================
+ Coverage     63.57%   63.66%   +0.09%     
- Complexity      398      404       +6     
============================================
  Files            70       71       +1     
  Lines          2306     2323      +17     
  Branches        160      160              
============================================
+ Hits           1466     1479      +13     
- Misses          768      772       +4     
  Partials         72       72              

Impacted Files	Coverage Δ
...ain/java/com/scality/osis/model/AnonymousUser.java	63.63% <63.63%> (ø)
...lity/osis/service/impl/ScalityOsisServiceImpl.java	87.92% <100.00%> (+0.10%)	⬆️

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[williamlardier]

Approving as my comment is not a mandatory change, but reducing the load of logs in our projects is also important 😄