This implements the `bitwise` namespace for expressions that allows performing
bitwise operations on booleans, integers and floating point values. This also
allows for bitwise aggregations.

List of implemented functions:

- [x] `bitwise.count_ones`
- [x] `bitwise.count_zeros`
- [x] `bitwise.leading_ones`
- [x] `bitwise.leading_zeros`
- [x] `bitwise.trailing_ones`
- [x] `bitwise.trailing_zeros`
- [ ] `bitwise.and`
- [ ] `bitwise.or`
- [ ] `bitwise.xor`

[skip ci]