Switch to generating completions at runtime #2683

Job	Run time
Rustfmt and clippy	50s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, --features=native-tls)	59s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, --no-default-features --features=native-tls,online...	52s
Test (x86_64-apple-darwin, macos-13, --features=native-tls)	1m 21s
Test (aarch64-apple-darwin, macos-14, --features=native-tls)	1m 27s
Test (x86_64-pc-windows-msvc, windows-latest, --features=native-tls)	1m 24s
Test (x86_64-unknown-linux-musl, ubuntu-latest, true)	1m 31s
Test (aarch64-unknown-linux-musl, ubuntu-latest, true, -- --test-threads=4)	2m 2s
Test (arm-unknown-linux-gnueabihf, ubuntu-latest, true, -- --test-threads=4)	1m 56s
	12m 22s

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