support batch circuit execution

[Roger-luo]

this would allow the compiler to generate a batch of quantum operations on a batch of registers, via a new keyward

for id in @eachregister
    if configs[id] == 1
           1 => X
    end
end

[Roger-luo]

A better way could be

@eachregister id begin
    if configs[id] == 1
           1 => X
    end
end

[Roger-luo]

actually @register id <expr> might be better