ISSDK-742: fix MoDisplayNames returns {Name} instead of actual values

[sagadira]

Problem

Get-IntersightAaaAuditRecord | select ObjectMoid,MoDisplayNames displays {Name} (JObject key) instead of actual values like BT-ntp-policy.

Root Cause

For response types extending AbstractOpenAPISchema (oneOf/anyOf wrappers like AaaAuditRecordResponse), ApiClient.ExecClientAsync calls FromJson() which re-deserializes using AbstractOpenAPISchema.SerializerSettings. These settings lacked the custom converter, so System.Object-typed properties (like MoDisplayNames) were left as raw JObject/JArray instead of being converted to native .NET types.

Fix

• ApiClient.mustache: Added NonPublicSetterContractResolver (enables private-setter deserialization with camelCase mapping) and ObjectToNativeDictionaryConverter (converts JObject to Dictionary, JArray to List, flattens single-element arrays to scalar for cleaner display).
• AbstractOpenAPISchema.mustache: Updated both SerializerSettings and AdditionalPropertiesSerializerSettings to use the same resolver and converter, ensuring the FromJson deserialization path produces native .NET types.

Result

Before: MoDisplayNames : {Name}
After: MoDisplayNames : {[Name, BT-ntp-policy]}