Date Encoding/Decoding Strategy

[swhitty]

Adds DateEncoding/DecodingStrategy allowing for dates to be encoded using alternate formats by setting the strategy.

The (existing) default strategy casts to Any leaving the instance unchanged:

var encoder = KeyValueEncoder()
encoder.dateEncodingStrategy = .date

// Date()
let any = try encoder.encode(Date())

ISO8601 compatible strings can be used:

encoder.dateEncodingStrategy = .iso8601()

// "1970-01-01T00:00:00Z"
let any = try encoder.encode(Date(timeIntervalSince1970: 0))

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (f2058a2) to head (c584af0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files           3        3           
  Lines         951      983   +32     
=======================================
+ Hits          950      982   +32     
  Misses          1        1           

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