Move C++ SDK to own folder #1777

Job	Run time
Checks / Python lints (black, mypy, flake8)	1m 29s
Checks / Test Python Docs	39s
Checks / Rust lints (fmt, check, cranky, tests, doc)	11m 7s
Checks / Check Rust web build (wasm32 + wasm-bindgen)	2m 7s
Checks / Rerun lints	7s
Checks / Lint TOML files	24s
Checks / Spell Check	5s
Minimum Wheel / Set Config	2s
Build Web / Build Web (wasm32 + wasm-bindgen)	4m 4s
Checks / Cargo Deny	1m 50s
Update PR Body / Update PR body	36s
Minimum Wheel / Build Wheels	12m 9s
Run Notebook / Run notebook	1m 43s
Build Web Demo / Build Web Demo	5m 36s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	9s
Save PR Summary / Create HTML summary for PR	41s
Upload Web Demo / Upload Web Demo to Google Cloud	41s
	43m 29s

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