chore: initial grpc command

composer.json

composer.lock

docs/pages/docs/features/grpc/index.md

src/Attribute/GrantsFeature.php

src/Attribute/TestsHttpResponse.php

src/Command/GrpcGenerate.php

src/Command/MailSend.php

src/Command/TestHttpResponders.php

src/DependencyInjectionContainer.php

...cyInjectionContainerException/DisabledFeatureProvider.php

src/DependencyProvider.php

src/DependencyProviderIterator.php

src/Feature.php

src/FeatureInterface.php

src/NameableEnumTrait.php

src/NameableInterface.php

src/ServerTaskHandler/SendsEmailMessage.php

...der/ConfigurationProvider/MailerConfigurationProvider.php

src/SingletonProvider/EventListenerAggregateProvider.php

src/SingletonProvider/MailerRepositoryProvider.php