Introduce SecretEntry trait

Now that we have introduced the notion of a secret abstracting over
whether something is a PIN or a password in terms of terminology, we
need to define what makes a secret in code. From the pinentry module's
perspective, the commonality between the two is that they both can be
entered through a dialog containing a prompt and a description, and they
can be cached.
This change introduces a trait, SecretEntry, that defines methods
representing those properties. Right now only the existing PinEntry
struct implements this trait.

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