Add config support to wistia-video-element

[comanzanares]

Adds a config property to to pass Wistia embed options via _wq.push({ options }), consistent with other elements like Vimeo, HLS, etc.
Merges config into Wistia options with user config taking precedence over attribute-derived defaults.
Added params based on Wistia embed options docs.
Updates the example to demonstrate passing config to Wistia works.
Adds a test to ensure config is forwarded into Wistia options.

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