Improved `Json` Implementation

[carson-katri]

Json is now more dynamic to support better reading of values, and optionals.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (dev@8aa6735). Click here to learn what that means. The diff coverage is 68.58%.

@@          Coverage Diff          @@
##             dev      #9   +/-   ##
=====================================
  Coverage       ?   65.2%           
=====================================
  Files          ?      21           
  Lines          ?     526           
  Branches       ?       0           
=====================================
  Hits           ?     343           
  Misses         ?     183           
  Partials       ?       0

Impacted Files	Coverage Δ
Sources/Request/Request/Extra/RequestChain.swift	80.76% <ø> (ø)
...es/Request/SwiftUI/RequestImage/RequestImage.swift	0% <0%> (ø)
Sources/Json/JsonBuilder.swift	0% <0%> (ø)
Tests/RequestTests/RequestTests.swift	94.26% <100%> (ø)
Sources/Json/JsonSubscript.swift	100% <100%> (ø)
Sources/Json/Literals.swift	25% <25%> (ø)
Sources/Request/Request/Request.swift	78.31% <41.66%> (ø)
Sources/Json/Json.swift	75.34% <75.34%> (ø)
Tests/RequestTests/JsonTests.swift	82.22% <82.22%> (ø)

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[carson-katri]

JsonBuilder was removed in favor of ExpressibleByDictionaryLiteral, as well as other literals:

let json: Json = ["key": "value"]
let json: Json = ["Hello", "World"]
let json: Json = "Hello, world!"
let json: Json = 5
let json: Json = 9.41

@dynamicMemberLookup allows subscripting to be more expressive:

// Instead of:
myJson["key"][0]["key2"]
// We can do:
myJson.key[0].key2

This is safer than the subscript, however both are available. You can also use the lookup to set values:

myJson.key[0].key2 = 5
myJson.key = ["Hello", "World"]