WIP http: Rework HTTP analysis APIs to accept VisibilityFilter

[witemple-msft]

This work-in-progress PR is an attempt to fix returnTypeVisibility/parameterVisibility by changing the HTTP library to use VisibilityFilter instances internally instead of Visibility flags. The public API is extended to accept VisibilityFilter everywhere that Visibility was required, and the API converts from Visibility to VisbilityFilter more eagerly.

This (provisionally, for the purposes of being able to easily identify where the flags type is used -- we may or may not decide to go forward with this) deprecates Visibility and the old signature for getVisibilitySuffix in favor of APIs that consume VisibilityFilter instances directly.

This hasn't quite fixed the issues with returnTypeVisibility but it's a step in the right direction.

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commit: 2af9675

[github-actions]

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[azure-sdk]

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