refactor: move mock APIs and services into mock module (#39)

internal/mock/api_health.go

@@ -0,0 +1,24 @@
+package mock
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/influxdata/influx-cli/v2/internal/api"
+)
+
+var _ api.HealthApi = (*HealthApi)(nil)
+
+type HealthApi struct {
+	GetHealthExecuteFn func(api.ApiGetHealthRequest) (api.HealthCheck, *http.Response, error)
+}
+
+func (p *HealthApi) GetHealth(context.Context) api.ApiGetHealthRequest {
+	return api.ApiGetHealthRequest{
+		ApiService: p,
+	}
+}
+
+func (p *HealthApi) GetHealthExecute(req api.ApiGetHealthRequest) (api.HealthCheck, *http.Response, error) {
+	return p.GetHealthExecuteFn(req)
+}