feat(interactions): add GetOption method to interaction data structs (#1535)

* Add ApplicationCommandInteractionData.GetOption
* Add ApplicationCommandInteractionDataOption.GetOption

---------

Co-authored-by: Fedor Lapshin <fe.lap.prog@gmail.com>

interactions.go

@@ -346,6 +346,18 @@ type ApplicationCommandInteractionData struct {
 	TargetID string `json:"target_id"`
 }
 
+// GetOption finds and returns an application command option by its name.
+func (d ApplicationCommandInteractionData) GetOption(name string) (option *ApplicationCommandInteractionDataOption) {
+	for _, opt := range d.Options {
+		if opt.Name == name {
+			option = opt
+			break
+		}
+	}
+
+	return
+}
+
 // ApplicationCommandInteractionDataResolved contains resolved data of command execution.
 // Partial Member objects are missing user, deaf and mute fields.
 // Partial Channel objects only have id, name, type and permissions fields.
@@ -428,6 +440,18 @@ type ApplicationCommandInteractionDataOption struct {
 	Focused bool `json:"focused,omitempty"`
 }
 
+// GetOption finds and returns an application command option by its name.
+func (o ApplicationCommandInteractionDataOption) GetOption(name string) (option *ApplicationCommandInteractionDataOption) {
+	for _, opt := range o.Options {
+		if opt.Name == name {
+			option = opt
+			break
+		}
+	}
+
+	return
+}
+
 // IntValue is a utility function for casting option value to integer
 func (o ApplicationCommandInteractionDataOption) IntValue() int64 {
 	if o.Type != ApplicationCommandOptionInteger {