SDK `DataLoader`s 6: customizable (external) loaders for Python #8294

Job	Run time
cpp-paths-filter	36s
rust-paths-filter	4s
Build Web / Build Web (wasm32 + wasm-bindgen)	6m 43s
Checks / Rerun lints	32s
Build JS / Build	4m 47s
Checks / Misc formatting	17s
Checks / Python lints (ruff, mypy, …)	34s
Checks / Test Python Docs	33s
Checks / Check if running codegen would produce any changes	2m 49s
Checks / Spell Check	39s
Update PR Body / Update PR body	37s
Minimum Wheel Build / Set Config (linux)	2s
Rust Checks / Check Rust web build (wasm32 + wasm-bindgen)	6m 20s
Rust Checks / Rust lints (fmt, check, cranky, tests, doc)	20m 4s
Rust Checks / Lint TOML files	31s
Rust Checks / Cargo Deny	2m 30s
C++ tests	0s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	3m 44s
Minimum Wheel Test / Set Config (linux)	2s
Build Examples / Build Examples	3m 33s
Run Notebook / Run notebook	2m 23s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	13m 26s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	8s
Save PR Summary / Create HTML summary for PR	30s
Track Sizes / Track Sizes	1m 1s
Upload Examples / Upload Examples to Google Cloud	25s
	1h 12m 50s

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