Make python-generated source files compatible with rustfmt #66889
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This PR adjusts the generators for src/libcore/num/dec2flt/table.rs, src/libcore/unicode/printable.rs, and src/libcore/unicode/tables.rs to make it so running
rustfmt
on the generated files no longer needs to apply any changes.This involves tweaking the python scripts where reasonable to better match rustfmt's style, and adding
#[rustfmt::skip]
to big constant tables that there's no point having rustfmt rewrap.r? @Dylan-DPC