Swap auth token manager class for auth token manager interface

...s/salesforce_mapping/src/Entity/MappedObjectInterface.php

modules/salesforce_pull/tests/src/Unit/DeleteHandlerTest.php

...rce_push/src/Plugin/SalesforcePushQueueProcessor/Rest.php

modules/salesforce_soap/src/Soap/SoapClient.php

salesforce.install

src/Commands/SalesforceCommandsBase.php

src/Entity/SalesforceAuthConfig.php

src/Form/SalesforceAuthSettings.php

src/Rest/RestClient.php

src/SalesforceAuthProviderPluginManager.php

src/Storage/SalesforceAuthTokenStorage.php