refactor: expose generated code and client business logic to share with Kapacitor (#103)

* refactor: take clients out of internal

* refactor: move stdio to pkg

* Move internal/api to api

* refactor: final changes for Kapacitor to access shared functionality

* chore: regenerate mocks

* fix: bad automated refactor

* chore: extra formatting not caught by make fmt

clients/ping/ping.go

@@ -0,0 +1,22 @@
+package ping
+
+import (
+	"context"
+
+	"github.com/influxdata/influx-cli/v2/api"
+	"github.com/influxdata/influx-cli/v2/clients"
+)
+
+type Client struct {
+	clients.CLI
+	api.HealthApi
+}
+
+// Ping checks the health of a remote InfluxDB instance.
+func (c Client) Ping(ctx context.Context) error {
+	if _, err := c.GetHealth(ctx).Execute(); err != nil {
+		return err
+	}
+	_, err := c.StdIO.Write([]byte("OK\n"))
+	return err
+}