add some string processors

internal/processing/string-decode.go

@@ -0,0 +1,35 @@
+package processing
+
+import (
+	"context"
+	"fmt"
+)
+
+type StringDecode struct {
+	config ProcessorConfig
+}
+
+func (sd *StringDecode) Process(ctx context.Context, payload any) (any, error) {
+	payloadBytes, ok := payload.([]byte)
+
+	if !ok {
+		return nil, fmt.Errorf("string.decode processor only accepts a []byte")
+	}
+
+	payloadMessage := string(payloadBytes)
+
+	return payloadMessage, nil
+}
+
+func (sd *StringDecode) Type() string {
+	return sd.config.Type
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type: "string.decode",
+		New: func(config ProcessorConfig) (Processor, error) {
+			return &StringDecode{config: config}, nil
+		},
+	})
+}