[`flake8-pyi`] Implement autofix and handle nested unions with single element (`PYI041` , `PYI055`) #35374

Job	Run time
cargo fmt	17s
Determine changes	8s
pre-commit	1m 3s
mkdocs	2m 25s
python package	1m 18s
cargo build (release)	2m 25s
benchmarks	2m 22s
cargo clippy	1m 43s
cargo build (msrv)	2m 20s
cargo fuzz	2m 20s
cargo test (linux)	2m 20s
cargo test (wasm)	1m 33s
cargo shear	24s
cargo test (windows)	2m 14s
formatter instabilities and black similarity	0s
test scripts	57s
ecosystem	1s
Fuzz the parser	1s
test ruff-lsp	1s
	23m 52s

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