Add meta to Security documents (User, Profile, Role)

[samniisan]

Introduces

• Meta in Security documents (User, Profile, Role)

Boyscoot

• Updated get Security document API endpoint (fetchUser|Profile|Role -> getUser|Profile|Role)

Should only be merged after Kuzzle side PR
kuzzleio/kuzzle#897

[codecov-io]

Codecov Report

Merging #144 into 3.x will decrease coverage by 0.08%.
The diff coverage is 87.8%.

@@            Coverage Diff             @@
##              3.x     #144      +/-   ##
==========================================
- Coverage   91.57%   91.49%   -0.09%     
==========================================
  Files          32       32              
  Lines        4678     4689      +11     
  Branches      437      438       +1     
==========================================
+ Hits         4284     4290       +6     
- Misses        268      272       +4     
- Partials      126      127       +1

Impacted Files	Coverage Δ
src/main/java/io/kuzzle/sdk/security/Profile.java	93.1% <100%> (ø)	⬆️
src/main/java/io/kuzzle/sdk/security/User.java	95.95% <100%> (ø)	⬆️
src/main/java/io/kuzzle/sdk/core/Kuzzle.java	92.24% <100%> (ø)	⬆️
src/main/java/io/kuzzle/sdk/security/Role.java	100% <100%> (ø)	⬆️
.../kuzzle/sdk/security/AbstractSecurityDocument.java	93.84% <77.77%> (-2.65%)	⬇️
src/main/java/io/kuzzle/sdk/security/Security.java	93.1% <89.28%> (-0.43%)	⬇️

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