Add “Escape shortcodes” settings for Plain Text fields

[brandonkelly]

For Craft 4.5+ installs, Plain Text fields should have a new “Escape shortcodes” feed setting. When enabled, non-null values should be passed through craft\helpers\StringHelper::escapeShortcodes(), so PlainText::normalizeValue() doesn’t convert them to emoji.

(See craftcms/cms#13036)