[C#] Add cancel support for futures and streams #3809

Job	Run time
Check	2m 21s
Rustfmt	4s
clippy	58s
Crate Unit Tests	2m 34s
verify-publish	2m 35s
Test Async (allowed to fail)	2m 36s
Build wit-bindgen (x86_64-linux, ubuntu-latest, x86_64-unknown-linux-gnu, ./ci/docker/x86_64-linu...	2m 35s
Build wit-bindgen (x86_64-macos, macos-latest, x86_64-apple-darwin, 10.12)	2m 38s
Build wit-bindgen (aarch64-macos, macos-latest, aarch64-apple-darwin, 10.12)	2m 35s
Build wit-bindgen (riscv64gc-linux, ubuntu-latest, riscv64gc-unknown-linux-gnu, ./ci/docker/riscv...	2m 32s
Build wit-bindgen (x86_64-windows, windows-latest, x86_64-pc-windows-msvc, -Ctarget-feature=+crt-...	2m 34s
Build wit-bindgen (aarch64-linux, ubuntu-latest, aarch64-unknown-linux-gnu, ./ci/docker/aarch64-l...	2m 33s
Build wit-bindgen (aarch64-windows, windows-11-arm, aarch64-pc-windows-msvc, -Ctarget-feature=+cr...	2m 36s
Test (windows-latest, rust)	2m 36s
Test (macos-latest, cpp)	2m 14s
Test (windows-latest, go)	2m 34s
Test (ubuntu-latest, go)	2m 34s
Test (macos-latest, go)	2m 24s
Test (macos-latest, c)	1m 56s
Test (windows-latest, c)	2m 33s
Test (ubuntu-latest, csharp)	2m 35s
Test (macos-latest, rust)	2m 37s
Test (ubuntu-latest, c)	2m 12s
Test (windows-latest, cpp)	2m 35s
Test (ubuntu-latest, cpp)	2m 33s
Test (windows-latest, csharp)	2m 35s
Test (ubuntu-latest, rust)	2m 25s
Record the result of testing and building steps	3s
	1h 3m 37s

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