resource options should support multi specification with better semantics

[ahakanbaba]

The resource options https://github.com/box/wavectl/blob/master/doc/CommandReference.md#resource-options should have better semantics if they are specified multiple times.

Right now, the later specified one overwrites an earlier specified one.

I think append action here is more suitable for them.
Whatever is specified mutiple times, the implementation should AND the speficied options.

For example if the user has specified
wavectl show alert --name "Kubernetes" --name "Node[0-9]+1"
the command should only return alerts whose name match both "Kubernetes" AND "Node[0-9]+1" regular expressions