No - there are no such steps that behave like a bitwise operator in Gremlin. You could of course use a lambda should your graph support such things (though CosmosDB does not):
gremlin> g.inject([a:-1,b:-1]).filter{(it.get().a & it.get().b) > 0}
gremlin> g.inject([a:00111100,b:00001101]).filter{(it.get().a & it.get().b) > 0}
==>[a:37440,b:577]
it feels at least strange that this basic operation would not be implemented in Gremlin.
Yes - I suppose it's simple but I don't think I've ever heard anyone ask for that functionality since the inception of the project. Gremlin is also missing some other important operators like basic string concatenation and date operations - those have definitely be requested.