Add enabled parameter to service (#175)

* feat: Add enabled flag to service
* Add IsEnabled method

Co-authored-by: 1newsr <1newsr@users.noreply.github.com>

core/service.go

@@ -45,6 +45,9 @@ var (
 
 // Service is the configuration of a monitored endpoint
 type Service struct {
+	// Enabled defines whether to enable the service
+	Enabled *bool `yaml:"enabled,omitempty"`
+
 	// Name of the service. Can be anything.
 	Name string `yaml:"name"`
 
@@ -91,6 +94,14 @@ type Service struct {
 	NumberOfSuccessesInARow int
 }
 
+// IsEnabled returns whether the service is enabled or not
+func (service Service) IsEnabled() bool {
+	if service.Enabled == nil {
+		return true
+	}
+	return *service.Enabled
+}
+
 // ValidateAndSetDefaults validates the service's configuration and sets the default value of fields that have one
 func (service *Service) ValidateAndSetDefaults() error {
 	// Set default values