func NewDefaultMessage(p level.Priority, message string) Composer {
	m := &stringMessage{Message: message}
	_ = m.SetPriority(p)
	return m
}
NewDefaultMessage provides a Composer interface around a single
string, which are always logable unless the string is empty.
package message
import "github.com/mongodb/grip/level"
type stringMessage struct {
	Message string `bson:"message" json:"message" yaml:"message"`
	Base    `bson:"metadata" json:"metadata" yaml:"metadata"`
	skipMetadata bool
}