remove fetchAllDocuments route

[benoitvidis]

This PR removes the fetchAllDocuments method from the SDK, which can be better replaced by a search + fetchNext call (documentation to come).

[codecov-io]

Codecov Report

Merging #134 into 3.x will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.x     #134      +/-   ##
==========================================
+ Coverage   91.34%   91.38%   +0.04%     
==========================================
  Files          33       33              
  Lines        4148     4320     +172     
  Branches      397      419      +22     
==========================================
+ Hits         3789     3948     +159     
- Misses        255      264       +9     
- Partials      104      108       +4

Impacted Files	Coverage Δ
src/main/java/io/kuzzle/sdk/core/Collection.java	96.89% <ø> (-0.16%)	⬇️
...ain/java/io/kuzzle/sdk/responses/SearchResult.java	55.55% <0%> (-5.56%)	⬇️
src/main/java/io/kuzzle/sdk/security/User.java	96.15% <0%> (+0.19%)	⬆️
src/main/java/io/kuzzle/sdk/security/Security.java	93.19% <0%> (+0.24%)	⬆️

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[scottinet]

You only removed a fetchAllDocuments overload, the main implementation is still there.

[benoitvidis]

oops.. -_-;... fixed

[samniisan]

You only removed a signature of fetchAlldocuments, the actual method doing the job is still just below :)