fix: let DataLoaderProvider handle data return from useDataLoader

[DorianMaliszewski]

Change the way that we handle data, based now on the cache directly.

It implies that :

• DataProvider is our source of trust
• User will never cant use this hook without key
• The hook is not responsible of the data

[codecov]

Codecov Report

Merging #150 (ecd4623) into master (2debbb0) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #150   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          269       265    -4     
  Branches        42        41    -1     
=========================================
- Hits           269       265    -4     

Impacted Files	Coverage Δ
packages/use-dataloader/src/reducer.js	100.00% <ø> (ø)
packages/use-dataloader/src/useDataLoader.js	100.00% <100.00%> (ø)

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