feat: Add credentialProviderConfig to SDK credential chain generation

Author: pulimsr

tools/code-generation/generator/src/main/resources/com/amazonaws/util/awsclientgenerator/velocity/cpp/ServiceClientSourceInit.vm

@@ -63,7 +63,11 @@
 #set($AdditionalServiceSpecificConfigLoadString = "Load${metadata.classNamePrefix}SpecificConfig(config);")
 #end
 #set($clientConfigurationNamespace = "Client")
+#if($clientConfiguration.profileName && !$clientConfiguration.profileName.empty())
+#set($defaultCredentialsProviderChainParam = "Aws::MakeShared<DefaultAWSCredentialsProviderChain>(ALLOCATION_TAG, Aws::Client::CredentialProviderConfiguration{clientConfiguration.profileName})")
+#else
 #set($defaultCredentialsProviderChainParam = "Aws::MakeShared<DefaultAWSCredentialsProviderChain>(ALLOCATION_TAG)")
+#end
 #set($s3ExpressIdentityProviderParam = "clientConfiguration.identityProviderSupplier(*this)")
 #set($simpleCredentialsProviderParam = "Aws::MakeShared<SimpleAWSCredentialsProvider>(ALLOCATION_TAG, credentials)")
 #set($hasEventStreamInputOperation = $serviceModel.hasStreamingRequestShapes())