add Delete method

internal/mapper/mapper.go

@@ -18,10 +18,15 @@ func (m Store[Key, Value]) Set(key Key, value Value) {
 	m[key] = value
 }
 
+func (m Store[Key, Value]) Delete(key Key) {
+	delete(m, key)
+}
+
 type Mapper interface {
 	Get(key string) (any, bool)
 	Has(key string) (bool)
 	Set(key string, value any)
+	Delete(key string)
 }
 
 type Getter[Key comparable, Value comparable] interface {
@@ -33,6 +38,7 @@ type Map[Key comparable, Value comparable] interface {
 	Get(key Key) (Value, bool)
 	Has(key Key) (bool)
 	Set(key Key, value Value)
+	Delete(key Key)
 }
 
 func New[Key comparable, Value comparable]() Store[Key, Value] {