Add DictionaryKeyPolicy to CosmosSerializationOptions

System.Text.Json allows consumers to specify a different naming policy for dictionary keys than for regular properties. This is supported via a DictionaryKeyPolicy property on JsonSerializerOptions. A similar capability should be provided for the out-of-the-box Cosmos serializer without having to implementing a custom serializer.

[ealsur]

I see two paths:

1. Add a bool to the CosmosSerializationOptions to apply the NamingPolicy to Dictionaries. The problem is mixing the boolean with a NamingPolicy that would not apply (like Default).
2. Add a new enum value to CosmosPropertyNamingPolicy, like CamelCaseOnlyProperties. This approach makes sure we set the flag in the CamelCasePropertyNamesContractResolver to false.

I’ll mark this as feature request to be tracked.

[davecluderay]

Yes, that is right. I want to be able to configure it so that dictionary keys pass through unchanged, regardless of the property naming strategy.