full support defaults of go.avito.ru/gl/psql

[kamilsk]

ParseEnvLibpq currently recognizes the following environment variables:
PGHOST
PGPORT
PGDATABASE
PGUSER
PGPASSWORD
PGSSLMODE
PGSSLCERT
PGSSLKEY
PGSSLROOTCERT
PGAPPNAME
PGCONNECT_TIMEOUT

type Options struct {
	host                 string
	port                 int
	user                 string
	password             string
	dbName               string
	sslMode              string
	Logger               pgx.Logger
	LogLevel             pgx.LogLevel
	Dial                 pgx.DialFunc
	RuntimeParams        map[string]string                         // Run-time parameters to set on connection as session default values (e.g. search_path or application_name)
	OnNotice             pgx.NoticeHandler                         // Callback function called when a notice response is received.
	CustomConnInfo       func(*pgx.Conn) (*pgtype.ConnInfo, error) // Callback function to implement connection strategies for different backends. crate, pgbouncer, pgpool, etc.
	CustomCancel         func(*pgx.Conn) error                     // Callback function used to override cancellation behavior
	preferSimpleProtocol bool
}

var defaultOptions = Options{
	sslMode:              "disable",
	preferSimpleProtocol: true,
}

[kamilsk]

won't do cause the main target of the tool is changed