Feature: #87748 - Add SiteProcessor

See forge#87748

Description

A new Site Processor \TYPO3\CMS\Frontend\DataProcessing\SiteProcessor has been introduced which can be used to fetch data from the site entity.

tt_content.mycontent.20 = FLUIDTEMPLATE
tt_content.mycontent.20 {
   file = EXT:myextension/Resources/Private/Templates/ContentObjects/MyContent.html

   dataProcessing.10 = TYPO3\CMS\Frontend\DataProcessing\SiteProcessor
   dataProcessing.10 {
      as = site
   }
}
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In the Fluid template the properties of the site entity can be accessed

<p>{site.rootPageId}</p>
<p>{site.someCustomConfiguration}</p>
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