Integrate AuthenticationProvider lib into Provisioning device lib

[abhipsaMisra]

The types in AuthenticationProvider are being used only in Microsoft.Azure.Devices.Provisioning.Client, so moving the types in there.

DPS auth -> IoT hub auth:

        private IAuthenticationMethod CreateAuthenticationMethodFromAuthProvider(
            AuthenticationProvider provisioningAuth,
            string deviceId)
        {
            VerboseTestLogger.WriteLine($"{nameof(CreateAuthenticationMethodFromAuthProvider)}({deviceId})");

            IAuthenticationMethod auth;
            if (provisioningAuth is AuthenticationProviderX509 x509Auth)
            {
                X509Certificate2 cert = x509Auth.GetAuthenticationCertificate();
                auth = new ClientAuthenticationWithX509Certificate(cert, deviceId);
            }
            else if (provisioningAuth is AuthenticationProviderSymmetricKey symmetricKeyAuth)
            {
                auth = new ClientAuthenticationWithSharedAccessKeyRefresh(symmetricKeyAuth.GetPrimaryKey(), deviceId);
            }
            else
            {
                throw new NotSupportedException($"Unknown provisioning auth type.");
            }

            return auth;
        }

[abhipsaMisra]

/azp run

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[abhipsaMisra]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).