Add mailer API and initial mailer view

platform/types/mailer.go

@@ -0,0 +1,16 @@
+package types
+
+import (
+	"time"
+)
+
+type Mailer struct {
+	Address                   Address   `json:"address"`
+	ComplianceReportRequestID *string   `json:"compliance_report_request_id"`
+	Created                   time.Time `json:"created"`
+	ID                        int32     `json:"id"`
+	Recipient                 string    `json:"recipient"`
+	SiteID                    int32     `json:"site_id"`
+	Status                    string    `json:"status"`
+	URI                       string    `json:"uri"`
+}