Add JSON (de/en)coder to Adapter's initializers

[williamhjcho]

JSON (de/en)coders can be configured with some other options, this just allows them to be inserted before initializing the adapters

More work should be done on whoever uses them

[codecov-io]

Codecov Report

Merging #23 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #23   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          21     21           
  Lines         242    248    +6     
  Branches       17     17           
=====================================
+ Hits          242    248    +6

Impacted Files	Coverage Δ
Sources/Frisbee/Adapters/EncoderJSONAdapter.swift	100% <100%> (ø)	⬆️
Sources/Frisbee/Adapters/DecoderJSONAdapter.swift	100% <100%> (ø)	⬆️

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[ronanrodrigo]

Nice!