[C#] Plotly.NET.CSharp Roadmap

This issue tracks the roadmap for the native C# package Plotly.NET.CSharp

Plans on how to design and develop the C# API have been laid out and tracked in #285 and #322.

The general roadmap implementation-wise is the following:

• 1. C# bindings for the high-level Chart construction API (#296), one binding per chart at first (no overloads)
• 2. C# GenericChart Extension methods (this covers more or less all styling functions). Once these are finished, the F# extension methods for fluent interface can be removed.
• 3. C# bindings for Object abstractions (TraceObjects, LayoutObjects, etc.) this might be a bit tricky
  Progress on this side has been made on the 'csharp-object-bindings' branch. In short, all these bindings can be auto-generated by using reflection on the F# objects. Might be worth to look into C# source generators

The way to go for the future is clearly code generation. The F# core API could in theory also created from the plotly.js JSON schema, but has many features that would be hard to automate such as type safety for enums etc.

To prevent having to namually maintain 2 code bases though, we should at least try to auto-generate the C# API based on the F# API, over which we have full control.

先阅读路线图条目以及 #285 和 #322 中之前的设计讨论。检查 csharp-object-bindings 分支，尤其是 src/Plotly.NET.Codegen，并评估所提出的代码生成方案；当剩余的 C# 扩展和对象绑定都已实现，且无需手动维护第二套 API 时，路线图即告完成。