feat(train): add new command to interact with aws and train models

vendor/github.com/aws/aws-sdk-go-v2/service/internal/s3shared/metadata.go

@@ -0,0 +1,28 @@
+package s3shared
+
+import (
+	"context"
+
+	"github.com/aws/smithy-go/middleware"
+)
+
+// clonedInputKey used to denote if request input was cloned.
+type clonedInputKey struct{}
+
+// SetClonedInputKey sets a key on context to denote input was cloned previously.
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func SetClonedInputKey(ctx context.Context, value bool) context.Context {
+	return middleware.WithStackValue(ctx, clonedInputKey{}, value)
+}
+
+// IsClonedInput retrieves if context key for cloned input was set.
+// If set, we can infer that the reuqest input was cloned previously.
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func IsClonedInput(ctx context.Context) bool {
+	v, _ := middleware.GetStackValue(ctx, clonedInputKey{}).(bool)
+	return v
+}