fix: Handle arrays in BooleanValidator

[camdecoster]

Description

Update BooleanValidator to handle arrays of values.

Addresses half of #5463. The other half is addressed by #5465.

Changes

• Handle arrays in BooleanValidator
• Add tests

Testing

• Be on main
• Run the following code:

  import plotly.graph_objects as go
  
  pie = go.Pie(
      labels=["A", "B", "C"],
      values=[65, 15, 20],
      showlegend=[True, False, False],
  )
  
  fig = go.Figure([pie], go.Layout())
  fig.show()

• Note that a ValueError is raised
• Switch to this branch
• Run the same code again
• Note that chart is rendered correctly

[emilykl]

Suggested change

	assert val == tuple(v)
	assert list(val) == v

clearer IMO

[camdecoster]

With your change, I removed the if/else block. Clearer indeed.

[emilykl]

Not 100% sure whether this call to to_scalar_or_list() is necessary, but I don't think it will hurt.

[emilykl]

LGTM 🚀