TINKHybridDecrypt: Public protocol that describes the functions implemented by
    the crypto primitives returned by TINKHybridDecryptFactory. The developer
    will use TINKHybridDecryptFactory to get a primitive that conforms to this
    protocol.

TINKHybridDecryptConfig: Public configuration interface. The user creates an
    instance and uses it to configure the TINKHybridDecryptFactory.

TINKHybridDecryptFactory: Public Factory that returns the crypto primitives.
    This is the only way to get a crypto primitive (TINKHybridDecrypt).

TINKHybridDecryptInternal: Internal-only class that's used to implement the
    crypto primitives. The user is not allowed to use this class to create a
    crypto primitive. Instead he should use the TINKHybridDecryptFactory. This
    class conforms to the public protocol TINKHybridDecrypt.

TINKHybridDecryptKeyManager: Parent class of all HybridDecrypt key managers.
    Doesn't contain any functionality we just use it to restrict the type of
    customKeyManagers that can be accepted by TINKHybridDecryptConfig.

TINKPBEciesAeadHkdfPrivateKeyManager:
TINKPBEciesAeadHkdfPublicKeyManager: These are both custom key managers that
    can be used with the TINKHyrbidDecryptConfig. After syncing with Thai these
    might not be needed as the user will have to implement and supply his own
    custom key managers.

Change-Id: I006ab7ea705bb913e068baf892981c1dc4f7cfb5
ORIGINAL_AUTHOR=Haris Andrianakis <candrian@google.com>
GitOrigin-RevId: 4a03068d668054fb314264c3e137bdec5a06b07b