Fix MapMembers grammar and update test #1536
Merged
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In IDL 2, map members can be mixed in, so Smithy grammar should reflect their optionality. #1533 incorrectly changed MapMembers grammar to make both MapKey and MapValue optional together, when they are optional separately. This PR fixes the MapMembers grammar to allow MapKey and MapValue to be optional separately, and updates a test case to reflect that.
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