`arrow2-convert` migration 2: non-serde blueprint types #4778

Job	Run time
Checks / Python lints (black, mypy, flake8)	6m 35s
Checks / Test Python Docs	41s
Checks / Check if running codegen would produce any changes	1m 27s
Checks / Rust lints (fmt, check, cranky, tests, doc)	11m 41s
Checks / Rerun lints	3m 25s
Checks / Check Rust web build (wasm32 + wasm-bindgen)	2m 52s
Checks / Lint TOML files	19s
Checks / Spell Check	7s
Checks / Cargo Deny	1m 24s
Checks / C++ formatting check	2m 41s
Build Web / Build Web (wasm32 + wasm-bindgen)	4m 36s
Build & Upload rerun_c (Linux x64) / Set Config (linux)	1s
Checks / C++ tests	10m 27s
Minimum Wheel / Set Config (linux)	6s
Update PR Body / Update PR body	2m 49s
Build & Upload rerun_c (Linux x64) / Build rerun_c (ubuntu-latest-16-cores)	2m 0s
Minimum Wheel / Build Wheels (ubuntu-latest-16-cores)	10m 40s
Run Notebook / Run notebook	1m 31s
Build Web Demo / Build Web Demo	4m 54s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	19s
Save PR Summary / Create HTML summary for PR	47s
Track Sizes / Track Sizes	49s
Upload Web Demo / Upload Web Demo to Google Cloud	1m 14s
	1h 11m 25s

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