[C#] Add cancel support for futures and streams #3806

Job	Run time
Rustfmt	6s
Check	2m 40s
Test Async (allowed to fail)	2m 46s
clippy	56s
verify-publish	2m 39s
Crate Unit Tests	2m 26s
Build wit-bindgen (x86_64-linux, ubuntu-latest, x86_64-unknown-linux-gnu, ./ci/docker/x86_64-linu...	2m 36s
Build wit-bindgen (x86_64-macos, macos-latest, x86_64-apple-darwin, 10.12)	1m 59s
Build wit-bindgen (aarch64-macos, macos-latest, aarch64-apple-darwin, 10.12)	2m 37s
Build wit-bindgen (x86_64-windows, windows-latest, x86_64-pc-windows-msvc, -Ctarget-feature=+crt-...	6m 20s
Build wit-bindgen (aarch64-linux, ubuntu-latest, aarch64-unknown-linux-gnu, ./ci/docker/aarch64-l...	2m 43s
Build wit-bindgen (aarch64-windows, windows-11-arm, aarch64-pc-windows-msvc, -Ctarget-feature=+cr...	3m 38s
Build wit-bindgen (riscv64gc-linux, ubuntu-latest, riscv64gc-unknown-linux-gnu, ./ci/docker/riscv...	2m 28s
Test (windows-latest, c)	4m 15s
Test (ubuntu-latest, c)	2m 6s
Test (ubuntu-latest, rust)	2m 41s
Test (macos-latest, rust)	3m 10s
Test (windows-latest, rust)	5m 47s
Test (macos-latest, go)	3m 54s
Test (windows-latest, cpp)	6m 11s
Test (ubuntu-latest, cpp)	3m 19s
Test (ubuntu-latest, csharp)	11m 40s
Test (windows-latest, go)	7m 23s
Test (ubuntu-latest, go)	4m 7s
Test (macos-latest, c)	1m 58s
Test (windows-latest, csharp)	15m 59s
Test (macos-latest, cpp)	2m 40s
Record the result of testing and building steps	3s
	1h 49m 7s

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