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

api/write_precision.go

@@ -0,0 +1,25 @@
+package api
+
+import (
+	"fmt"
+)
+
+func (v WritePrecision) String() string {
+	return string(v)
+}
+
+func (v *WritePrecision) Set(s string) error {
+	switch s {
+	case "ms":
+		*v = WRITEPRECISION_MS
+	case "s":
+		*v = WRITEPRECISION_S
+	case "us":
+		*v = WRITEPRECISION_US
+	case "ns":
+		*v = WRITEPRECISION_NS
+	default:
+		return fmt.Errorf("unsupported precision: %q", s)
+	}
+	return nil
+}