Nim Doublets Adapter via GraphQL client + Native DLL

[Konard]

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This adapter should provide standard Doublets CRUD operations API in the native to Nim code style (the most commonly used one).
The libraries' architecture should take in account the ability to swap GraphQL with a native library that will be shipped later (when we finish translation to C++).
The GraphQL client layer should be usable separately as well as native to Nim's API.
There should be 3 packages for Nimble:

1. Platform.Data.Doublets.Native (DLL api wrapped in Nim only)
2. Platform.Data.Doublets.Gql.Client (GraphQL client to doublets only)
3. Platform.Data.Doublets.Client (Abstract API for both Platform.Data.Doublets.Native and Platform.Data.Doublets.Gql.Client)