feat: implement caldav search

vendor/github.com/dolanor/caldav-go/icalendar/properties/interfaces.go

@@ -0,0 +1,29 @@
+package properties
+
+type CanValidateValue interface {
+	ValidateICalValue() error
+}
+
+type CanDecodeValue interface {
+	DecodeICalValue(string) error
+}
+
+type CanDecodeParams interface {
+	DecodeICalParams(Params) error
+}
+
+type CanEncodeTag interface {
+	EncodeICalTag() (string, error)
+}
+
+type CanEncodeValue interface {
+	EncodeICalValue() (string, error)
+}
+
+type CanEncodeName interface {
+	EncodeICalName() (PropertyName, error)
+}
+
+type CanEncodeParams interface {
+	EncodeICalParams() (Params, error)
+}