Allow key.Matches to accept multiple binding arguments

[meowgorithm]

key.Binding currently allows you to bind against multiple keys:

binding := key.Binding(key.WithKeys("q", "ctrl+c"))

However, sometimes you may also want to match on multiple bindings at once:

left := key.Binding(key.WithKeys("h", "left"))
right := key.Binding(key.WithKeys("l", "right"))

case key.Matches(msg, left), key.Matches(msg, right):

This update expands key.Matches to accept multiple arguments so you can condense the above case statement to:

case key.Matches(msg, left, right):