zero: refactor telemetry and controller (#5135)

* zero: refactor controller

* refactor zero telemetry and controller

* wire with connect handler

* cr

internal/zero/telemetry/sessions/storage_test.go

@@ -0,0 +1,29 @@
+package sessions_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/pomerium/pomerium/internal/zero/telemetry/sessions"
+)
+
+func TestStorage(t *testing.T) {
+	t.Parallel()
+
+	now := time.Date(2020, 1, 2, 3, 4, 5, 6, time.UTC)
+	state := &sessions.MetricState{
+		Data:      []byte("data"),
+		LastReset: now,
+	}
+
+	pbany := state.ToAny()
+	assert.NotNil(t, pbany)
+
+	var newState sessions.MetricState
+	err := newState.FromAny(pbany)
+	assert.NoError(t, err)
+	assert.EqualValues(t, state.Data, newState.Data)
+	assert.EqualValues(t, state.LastReset.Truncate(time.Second), newState.LastReset.Truncate(time.Second))
+}