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

[samniisan]

Introduces

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

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

[codecov-io]

Codecov Report

Merging #236 into 5.x will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              5.x     #236      +/-   ##
==========================================
+ Coverage   98.41%   98.46%   +0.04%     
==========================================
  Files          17       17              
  Lines        2144     2147       +3     
  Branches      610      611       +1     
==========================================
+ Hits         2110     2114       +4     
+ Misses         34       33       -1

Impacted Files	Coverage Δ
src/Collection.js	98.03% <ø> (ø)	⬆️
src/security/SecurityDocument.js	100% <100%> (ø)	⬆️
src/security/Security.js	97.74% <100%> (ø)	⬆️
src/Kuzzle.js	98.94% <100%> (+0.17%)	⬆️
src/security/Profile.js	100% <100%> (ø)	⬆️
src/security/User.js	98.76% <100%> (ø)	⬆️
src/security/Role.js	100% <100%> (ø)	⬆️

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