[SR-10698] PropertyListEncoder should allow an option to maintain key order

[tonyarnold]

Previous ID	SR-10698
Radar	None
Original Reporter	@tonyarnold
Type	New Feature

Additional Detail from JIRA

Votes	0
Component/s	Foundation
Labels	New Feature, Codable
Assignee	bendjones (JIRA)
Priority	Medium

md5: bf400fd4a628aa921f21e7ef2a8a1fe8

Issue Description:

When editing property lists via Xcode, the order of keys is maintained. I would like to have the same option for PropertyListEncoder.

I realise that this would be tied up with an OrderedDictionary implementation, but best to have it written down somewhere, right?

[swift-ci]

Comment by Ben D. Jones (JIRA)

@swift-cisync