support opening a connection with custom flags

The new `ConnectFlags` supports passing in `sqliteh.OpenFlags` to configure
the connection.

`Connect` still uses `sqliteh.OpenFlagsDefault`.

Updates tailscale/corp#36592

Signed-off-by: Percy Wegmann <percy@tailscale.com>

Author: oxtoacart

sqlite.go

@@ -153,8 +153,13 @@ type connector struct {
 }
 
 func (p *connector) Driver() driver.Driver { return drv{} }
+
 func (p *connector) Connect(ctx context.Context) (driver.Conn, error) {
-	db, err := Open(p.name, sqliteh.OpenFlagsDefault, "")
+	return p.ConnectFlags(ctx, sqliteh.OpenFlagsDefault)
+}
+
+func (p *connector) ConnectFlags(ctx context.Context, flags sqliteh.OpenFlags) (driver.Conn, error) {
+	db, err := Open(p.name, flags, "")
 	if err != nil {
 		if ec, ok := err.(sqliteh.ErrCode); ok {
 			e := &Error{