Support bitwise XOR operator (`#`)

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
See usecase from @FauxFaux on #1619

The only remaining bitwise operator left to go is bitwise XOR (#) which is tracked by this ticket

Describe the solution you'd like
Implement bitwise XOR operator (following the model of bitwise AND & and OR |) -- see PRs linked from #1619

I think this is a good first issue as there are existing operator examples which can be followed and newcomers could learn the codebase

[askoa]

I'll take a shot at this!