StripTrailingHostDot: Expose new configuration option to enable Envoy removal of trailing dot on hostnames

[saley89]

Fixes #6334

This PR adds:

• A new configuration option in the NetworkParameters of Contour.
• The new option is called StripTrailingHostDot.
• This option when set to true will configure all Envoy routing to strip any trailing dot from a hostname before processing the request. This will allow it to be matched by any existing routes for that hostname without a dot.
• Tests to show the configuration option set to to true being added to the underlying listener configuration.

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