Display and Debug don't honor @sensitive for individual fields

[jjant]

As discussed in #1743 (comment), the current @sensitive implementation only respects the trait when logging the structure containing the sensitive field, but not when logging the field itself.

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A possible fix to this issue, is to newtype @sensitive shapes in the generated code, overriding their Display and Debug implementations through the Sensitive type.

[82marbag]

We’ve discussed that we are currently not going ahead with this task until further design and agreement on how to proceed.

[82marbag]

The proposal has been made. Waiting for the final review and decision before unblocking this issue