feat(csharp) .NET 8.0 code migration (#966)
* .net 8.0 migration
* update docs
* revert change
* revert change and update appendix docs
* remove static
* Update binary_search_insertion.cs
* Update binary_search_insertion.cs
* Update binary_search_edge.cs
* Update binary_search_insertion.cs
* Update binary_search_edge.cs
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Co-authored-by: Yudong Jin <krahets@163.com>
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