Issue #3366705: Latest exchange rates shouldn't be saved in config

commerce_exchanger.install

commerce_exchanger.services.yml

config/schema/commerce_exchanger.schema.yml

src/AbstractExchangerCalculator.php

src/Annotation/CommerceExchangerProvider.php

src/DefaultExchangerCalculator.php

src/Entity/ExchangeRates.php

src/Entity/ExchangeRatesInterface.php

src/ExchangerCalculatorInterface.php

src/ExchangerManager.php

src/ExchangerManagerInterface.php

src/ExchangerProviderRates.php

src/Form/ExchangeRatesForm.php

...gin/Commerce/ExchangerProvider/CurrencylayerExchanger.php

...mmerce/ExchangerProvider/EuropeanCentralBankExchanger.php

...ugin/Commerce/ExchangerProvider/ExchangerProviderBase.php

...Commerce/ExchangerProvider/ExchangerProviderInterface.php

...ommerce/ExchangerProvider/ExchangerProviderRemoteBase.php

src/Plugin/Commerce/ExchangerProvider/FixerExchanger.php

...Commerce/ExchangerProvider/OpenExchangeRatesExchanger.php