Add `Options::width` #967

Job	Run time
Windows (stable, default features)	1m 58s
Ubuntu (stable, no default features)	30s
Compute binary sizes	38s
Ubuntu (stable, all features)	46s
Build benchmarks	38s
Ubuntu (stable, default features)	21s
Build documentation	16s
Ubuntu (nightly, no default features)	41s
Ubuntu (nightly, all features)	55s
Fuzz test (fill_first_fit)	1m 34s
Minimum supported Rust version (no default features)	7m 9s
Ubuntu (nightly, default features)	43s
Minimum supported Rust version (all features)	7m 32s
Fuzz test (fill_optimal_fit)	2m 11s
Minimum supported Rust version (default features)	7m 15s
Fuzz test (fill_fast_path)	1m 50s
Build Wasm demo	26s
Fuzz test (wrap_first_fit)	1m 36s
Fuzz test (wrap_optimal_fit)	1m 40s
Fuzz test (wrap_optimal_fit_usize)	1m 33s
Fuzz test (wrap_fast_path)	1m 37s
Fuzz test (unfill)	1m 49s
Fuzz test (refill)	1m 51s
Deploy Wasm demo	0s
	45m 29s

Provide feedback