chore: Move httpapi, httpmw, & database into coderd (#568)

* chore: Move httpmw to /coderd directory
httpmw is specific to coderd and should be scoped under coderd

* chore: Move httpapi to /coderd directory
httpapi is specific to coderd and should be scoped under coderd

* chore: Move database  to /coderd directory
database is specific to coderd and should be scoped under coderd

* chore: Update codecov & gitattributes for generated files
* chore: Update Makefile

coderd/database/pubsub_memory_test.go

@@ -0,0 +1,35 @@
+package database_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/coderd/database"
+)
+
+func TestPubsubMemory(t *testing.T) {
+	t.Parallel()
+
+	t.Run("Memory", func(t *testing.T) {
+		t.Parallel()
+
+		pubsub := database.NewPubsubInMemory()
+		event := "test"
+		data := "testing"
+		messageChannel := make(chan []byte)
+		cancelFunc, err := pubsub.Subscribe(event, func(ctx context.Context, message []byte) {
+			messageChannel <- message
+		})
+		require.NoError(t, err)
+		defer cancelFunc()
+		go func() {
+			err = pubsub.Publish(event, []byte(data))
+			require.NoError(t, err)
+		}()
+		message := <-messageChannel
+		assert.Equal(t, string(message), data)
+	})
+}