Add `wrap`, `fill`, `refill` methods to `Options` #970

Job	Run time
Build benchmarks	30s
Windows (stable, default features)	1m 46s
Compute binary sizes	41s
Build documentation	23s
Fuzz test (fill_first_fit)	1m 56s
Minimum supported Rust version (no default features)	7m 22s
Fuzz test (fill_optimal_fit)	1m 33s
Minimum supported Rust version (all features)	7m 36s
Ubuntu (stable, no default features)	16s
Minimum supported Rust version (default features)	9m 26s
Ubuntu (stable, all features)	39s
Fuzz test (fill_fast_path)	2m 15s
Ubuntu (stable, default features)	23s
Fuzz test (wrap_first_fit)	1m 33s
Build Wasm demo	36s
Ubuntu (nightly, no default features)	48s
Fuzz test (wrap_optimal_fit)	1m 33s
Ubuntu (nightly, all features)	55s
Fuzz test (wrap_optimal_fit_usize)	1m 38s
Ubuntu (nightly, default features)	49s
Fuzz test (wrap_fast_path)	1m 38s
Fuzz test (unfill)	1m 52s
Fuzz test (refill)	1m 51s
Deploy Wasm demo	0s
	47m 59s

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