postgres: replace the package lib/pq with pgx (#15343)

* WIP replacing lib/pq

* change timezome param to be URI format

* add changelog

* add changelog for redshift

* update changelog

* add test for DSN style connection string

* more parseurl and quoteidentify to sdk; include copyright and license

* call dbutil.ParseURL instead, fix import ordering

Co-authored-by: Calvin Leung Huang <1883212+calvn@users.noreply.github.com>

plugins/database/postgresql/postgresql_test.go

@@ -8,8 +8,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/hashicorp/vault/sdk/database/helper/dbutil"
+
 	"github.com/hashicorp/vault/helper/testhelpers/postgresql"
-	dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
+	"github.com/hashicorp/vault/sdk/database/dbplugin/v5"
 	dbtesting "github.com/hashicorp/vault/sdk/database/dbplugin/v5/testing"
 	"github.com/hashicorp/vault/sdk/helper/template"
 	"github.com/stretchr/testify/require"
@@ -61,6 +63,32 @@ func TestPostgreSQL_InitializeWithStringVals(t *testing.T) {
 	}
 }
 
+func TestPostgreSQL_Initialize_ConnURLWithDSNFormat(t *testing.T) {
+	cleanup, connURL := postgresql.PrepareTestContainer(t, "13.4-buster")
+	defer cleanup()
+
+	dsnConnURL, err := dbutil.ParseURL(connURL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	connectionDetails := map[string]interface{}{
+		"connection_url": dsnConnURL,
+	}
+
+	req := dbplugin.InitializeRequest{
+		Config:           connectionDetails,
+		VerifyConnection: true,
+	}
+
+	db := new()
+	dbtesting.AssertInitialize(t, db, req)
+
+	if !db.Initialized {
+		t.Fatal("Database should be initialized")
+	}
+}
+
 func TestPostgreSQL_NewUser(t *testing.T) {
 	type testCase struct {
 		req            dbplugin.NewUserRequest
@@ -675,7 +703,7 @@ func testCredsExist(t testing.TB, connURL, username, password string) error {
 	t.Helper()
 	// Log in with the new creds
 	connURL = strings.Replace(connURL, "postgres:secret", fmt.Sprintf("%s:%s", username, password), 1)
-	db, err := sql.Open("postgres", connURL)
+	db, err := sql.Open("pgx", connURL)
 	if err != nil {
 		return err
 	}