adds make choice test story

[bulbil]

@stephenwf @abrin here is an example test of an issue we've been working through: How to handle choice in sequence panel?

Expected

Supplying a valid choice id as a makeChoice() argument will update any annotation page choice currently displayed, even when displaying a sequence with multiple canvases and multiple annotation pages.

Observed

• Valid choice ids do not update annotation instances in some cases
• With multiple annotation pages, (I believe) only annotation pages on one of the canvases is available to apply choice at a time

I believe the issue is that it is not obvious in sequence panel which is the current viewer reference (or whether that is even exposed) when makeChoice is called.

In the supplied story:

• Canvas 3: should toggle between two choices (verso, recto) but does not
• Canvas 11: "Toggle current choice" sometimes toggles the annotation page on the left and sometimes on the right.
• Canvas 11: Valid choice ids sometimes (see dropdown select) will affect one but not both annotation pages.

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Latest deployment of this branch, based on commit 675692a:

Sandbox	Source
simple-vue	Configuration
vue-3-carousel	Configuration
external-stylesheet-sandbox	Configuration
example-sandbox	Configuration
custom-preset	Configuration
react-choices-example	Configuration
reacting-to-the-user	Configuration
external-annotation-pages	Configuration
virtual-annotation-pages	Configuration
loading-annotation-pages	Configuration
annotation-display-1	Configuration
annotation-display-2	Configuration
choice-example	Configuration
choice-react	Configuration
more-regions-1	Configuration
more-regions-2	Configuration
regions-1	Configuration
regions-2	Configuration
regions-3	Configuration
regions-4	Configuration
regions-5	Configuration
regions-6	Configuration
responsive-1	Configuration