RFC: Runtime Root Key Decoding

[wmcginty]

This provides an implementation for being able to being decoding a JSON blob at an arbitrary String 'rootKey'. We currently have similar functionality using the DecodableContainerType, but this involves the generation of a type for each possible key, and so is enforced at compile time.

This method (I have kept DecodableContainerType available in the interface) sacrifices some run time performance for the ability to provide that String at runtime.

While the current implementation accept only a single String parameter, the same logic could be applied to an array of Strings at the cost of additional performance.

[codecov-io]

Codecov Report

Merging #41 into release/2.0.0 will increase coverage by 0.44%. The diff coverage is 98.33%.

@@                Coverage Diff                @@
##           release/2.0.0      #41      +/-   ##
=================================================
+ Coverage          95.82%   96.26%   +0.44%     
=================================================
  Files                 26       28       +2     
  Lines                814      991     +177     
=================================================
+ Hits                 780      954     +174     
- Misses                34       37       +3

Impacted Files	Coverage Δ
...Request/AnyNetworkRequest+DecodableContainer.swift	100% <100%> (ø)	:arrow_up:
Tests/Helper/Mocks/MockDecodableContainer.swift	100% <100%> (ø)
Sources/Hyperspace/Request/AnyDecodable.swift	97.91% <97.91%> (ø)
Tests/DecodingTests.swift	94.56% <98.19%> (+5.09%)	:arrow_up:

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[wmcginty]

Typos fixed and requests are now asserting on specific DecodingErrors.