onnxruntime

1e18efad - [C#] Add ML Sequences and Maps Create and Process APIs (#16648)

[C#] Add ML Sequences and Maps Create and Process APIs (#16648) ### Description 1) Added Sequence And Maps convenience APIs to create input Sequences and Maps and also visit the outputs. 2) Address OrtValue design issue when the values are created on top of the managed memory and the ortValues are used for sequence and maps creation. We should retain the original managed instances that keep the memory pinned. We opt to keep track of those and dispose of them within an instance of OrtValue that represents a Map or a Sequence. 3) Set `LangVersion` to default per [MS Versioning Docs.](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version) ### Motivation and Context 1) When writing code examples, use of Map and Sequences API proved to be cumbersome. 2) It is a BUG, that we should address, as the managed memory can move by the GC and lead to intermittent crashes. 3) Make use of the most feature of the C#.