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:

varencoder=KeyValueEncoder()
encoder.dateEncodingStrategy =.date
// Date()
letany=try encoder.encode(Date())

ISO8601 compatible strings can be used:

encoder.dateEncodingStrategy =.iso8601()
// "1970-01-01T00:00:00Z"
letany=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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