BooleanBufferBuilder Fails to Clear Set Bits On Truncate

[tustvold]

Describe the bug

BooleanBufferBuilder operates on the assumption that unset bits are zeroed, this is not always the case

To Reproduce

let b = MutableBuffer::from_iter([true, true, true, true]);
let mut builder = BooleanBufferBuilder::new_from_buffer(b, 2);
builder.advance(2);
let finished = builder.finish();
assert_eq!(finished.as_slice(), &[0b00000011])

let mut builder = BooleanBufferBuilder::new(10);
builder.append_n(5, true);
builder.resize(3);
builder.advance(2);
let finished = builder.finish();
assert_eq!(finished.as_slice(), &[0b00000111]);

Expected behavior

Additional context

[tustvold]

label_issue.py automatically added labels {'arrow'} from #3588