[FEATURE] add ContentAreaProcessor for TYPO3 v14 f:render.contentArea

[Kanti]

Automatically detects if content element has container columns
adds them lazily to the content variable.
The ContentArea can be used in f:render.contentArea ViewHelper
Only use this DataProcessor for TYPO3 v14 or higher:

lib.contentElement.dataProcessing.1773665522 = B13\Container\DataProcessing\ContentAreaProcessor
#or
tt_content.b13-2cols < lib.contentElement
tt_content.b13-2cols {
  templateName = 2Cols
  templateRootPaths.10 = EXT:base/Resources/Private/Templates
  dataProcessing.100 = B13\Container\DataProcessing\ContentAreaProcessor
}

<f:render.contentArea contentArea="{content.200}" />