Feature: #106415 - Add stdWrap to config.htmlTag.attributes.[attr]

Description

Each attribute within the TypoScript option config.htmlTag.attributes.[attr] now supports all stdWrap properties.

This option controls the attributes of the single <html> element of a rendered page.

It is now possible to use userFunc, override, or getData within TypoScript:

Using override in TypoScript

config.htmlTag.attributes{
    my-attribute = 123
    my-attribute.override = 456
}

Using userFunc in TypoScript

config.htmlTag.attributes {
    my-attribute = 123
    my-attribute.userFunc = MyVendor\\MyExtension\\HtmlTagEnhancer->overrideMyAttribute
}