feat: use strings instead of float64s

Convert the Upstream health threshold and Target createdat values from
float64 to string.

Use of float64 doesn't allow controller-gen to automate manifests from
these types, and using string instead is the typical approach in other
projects:
kubernetes-sigs/controller-tools#245

kong/types.go

@@ -157,7 +157,7 @@ type PassiveHealthcheck struct {
 type Healthcheck struct {
 	Active    *ActiveHealthcheck  `json:"active,omitempty" yaml:"active,omitempty"`
 	Passive   *PassiveHealthcheck `json:"passive,omitempty" yaml:"passive,omitempty"`
-	Threshold *float64            `json:"threshold,omitempty" yaml:"threshold,omitempty"`
+	Threshold *string             `json:"threshold,omitempty" yaml:"threshold,omitempty"`
 }
 
 // HealthDataAddress represents the health data address of a target
@@ -192,7 +192,7 @@ type HealthData struct {
 // +k8s:deepcopy-gen=true
 type UpstreamNodeHealth struct {
 	ID        *string     `json:"id,omitempty" yaml:"id,omitempty"`
-	CreatedAt *float64    `json:"created_at,omitempty" yaml:"created_at,omitempty"`
+	CreatedAt *string     `json:"created_at,omitempty" yaml:"created_at,omitempty"`
 	Data      *HealthData `json:"data,omitempty" yaml:"data,omitempty"`
 	Health    *string     `json:"health,omitempty" yaml:"data,omitempty"`
 	Target    *string     `json:"target,omitempty" yaml:"target,omitempty"`
@@ -224,7 +224,7 @@ type Upstream struct {
 // Target represents a Target in Kong.
 // +k8s:deepcopy-gen=true
 type Target struct {
-	CreatedAt *float64  `json:"created_at,omitempty" yaml:"created_at,omitempty"`
+	CreatedAt *string   `json:"created_at,omitempty" yaml:"created_at,omitempty"`
 	ID        *string   `json:"id,omitempty" yaml:"id,omitempty"`
 	Target    *string   `json:"target,omitempty" yaml:"target,omitempty"`
 	Upstream  *Upstream `json:"upstream,omitempty" yaml:"upstream,omitempty"`