[BUG] Postgres support for metadata store (#1459)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
	 - This PR fixes the dbcore code that originally connects MySQL family
 - New functionality
	 - ...

## Test plan
*How are these changes tested?*

- [ ] Manual testing by connecting to Postgres

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need
to make documentation changes in the [docs
repository](https://github.com/chroma-core/docs)?*

go/coordinator/cmd/grpccoordinator/cmd.go

@@ -26,7 +26,8 @@ func init() {
 	Cmd.Flags().StringVar(&conf.SystemCatalogProvider, "system-catalog-provider", "memory", "System catalog provider")
 	Cmd.Flags().StringVar(&conf.Username, "username", "root", "MetaTable username")
 	Cmd.Flags().StringVar(&conf.Password, "password", "", "MetaTable password")
-	Cmd.Flags().StringVar(&conf.Address, "db-address", "127.0.0.1:3306", "MetaTable db address")
+	Cmd.Flags().StringVar(&conf.Address, "db-address", "127.0.0.1", "MetaTable db address")
+	Cmd.Flags().IntVar(&conf.Port, "db-port", 5432, "MetaTable db port")
 	Cmd.Flags().StringVar(&conf.DBName, "db-name", "", "MetaTable db name")
 	Cmd.Flags().IntVar(&conf.MaxIdleConns, "max-idle-conns", 10, "MetaTable max idle connections")
 	Cmd.Flags().IntVar(&conf.MaxOpenConns, "max-open-conns", 10, "MetaTable max open connections")

go/coordinator/internal/grpccoordinator/server.go

@@ -28,6 +28,7 @@ type Config struct {
 	Username     string
 	Password     string
 	Address      string
+	Port         int
 	DBName       string
 	MaxIdleConns int
 	MaxOpenConns int
@@ -69,6 +70,7 @@ func New(config Config) (*Server, error) {
 			Username:     config.Username,
 			Password:     config.Password,
 			Address:      config.Address,
+			Port:         config.Port,
 			DBName:       config.DBName,
 			MaxIdleConns: config.MaxIdleConns,
 			MaxOpenConns: config.MaxOpenConns,

go/coordinator/internal/metastore/db/dbcore/core.go

@@ -24,14 +24,15 @@ type DBConfig struct {
 	Username     string
 	Password     string
 	Address      string
+	Port         int
 	DBName       string
 	MaxIdleConns int
 	MaxOpenConns int
 }
 
 func Connect(cfg DBConfig) (*gorm.DB, error) {
-	dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4&parseTime=True&loc=Local&tls=true&interpolateParams=true",
-		cfg.Username, cfg.Password, cfg.Address, cfg.DBName)
+	dsn := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%d",
+		cfg.Address, cfg.Username, cfg.Password, cfg.DBName, cfg.Port)
 
 	ormLogger := logger.Default
 	ormLogger.LogMode(logger.Info)