Kzl 1347/Auth controller

[Shiranuit]

⚠️ Depends on [#41]

What does this PR do ?

This PR adds the AuthController

How should this be manually tested?

Run cd kuzzle-sdk-java && ./gradlew test

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (KZL-1346/sdk-v3-websocket-unit-tests@1f2f9dc). Click here to learn what that means.
The diff coverage is 13.63%.

@@                           Coverage Diff                           @@
##             KZL-1346/sdk-v3-websocket-unit-tests      #43   +/-   ##
=======================================================================
  Coverage                                        ?   64.26%           
  Complexity                                      ?       77           
=======================================================================
  Files                                           ?       20           
  Lines                                           ?      375           
  Branches                                        ?       29           
=======================================================================
  Hits                                            ?      241           
  Misses                                          ?      114           
  Partials                                        ?       20

Impacted Files	Coverage Δ	Complexity Δ
.../io/kuzzle/sdk/API/Controllers/BaseController.java	100% <100%> (ø)	1 <1> (?)
...se/src/main/java/io/kuzzle/sdk/AbstractKuzzle.java	60% <100%> (ø)	13 <0> (?)
.../io/kuzzle/sdk/API/Controllers/AuthController.java	5% <5%> (ø)	1 <1> (?)

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[jenow]

Continue this work on #52