Add Codable support

[JosephDuffy]

TODO

• [x] Add Decodable support
• [x] Add an equivalent to unwrapped that's added by PartialConvertible when Wrapped is PartialCodable
• [ ] Support embedded partials, builders
• [ ] Find a more appropriate name for PartialCodable

[codecov[bot]]

Codecov Report

Merging #175 (79f8225) into master (8395463) will increase coverage by 1.94%. The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   92.81%   94.75%   +1.94%     
==========================================
  Files           6        8       +2     
  Lines         153      381     +228     
==========================================
+ Hits          142      361     +219     
- Misses         11       20       +9     

Impacted Files	Coverage Δ
Sources/Partial/Partial.swift	82.35% <72.72%> (-10.51%)	:arrow_down:
Sources/Partial/PartialBuilder.swift	91.75% <75.00%> (-1.51%)	:arrow_down:
...s/Partial/Codable/KeyPathCodingKeyCollection.swift	87.50% <87.50%> (ø)
...al/Codable/KeyPathCodingKeyCollectionBuilder.swift	100.00% <100.00%> (ø)

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[iSevenDays]

That would be a really great feature!

Imagine I have a profile and a complete profile with details. Profile: id name

Full profile: id name email company

With this PR merged, I could merge models and parse them from JSON.

[JosephDuffy]

That would be a really great feature!

Imagine I have a profile and a complete profile with details.

Profile:

id

name

Full profile:

id

name

email

company

With this PR merged, I could merge models and parse them from JSON.

This is certainly a good use case, I do plan to work on this when I have more spare time. I don't personally need this feature so it's not a top priority for me currently!