feature: add OptionsResponseMiddleware for handling OPTIONS requests

Sylvain Roquebertrequested to merge
feature/options-response-as-200 into master

Added a new OptionsResponseMiddleware middleware to complement AllowRequestedCORSMiddleware by shortcutting middleware stack and returning an empty 200 response. Must be place after AllowRequestedCORSMiddleware in the stack to get the CORS headers.

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