Feature: #108846 - Console command to inspect global ViewHelper namespaces 

See forge#108846

Description 

The new console command fluid:namespaces has been introduced which lists all available global ViewHelper namespaces in the current project. This can be used to verify the current configuration. With the --json option, it is also possible to access that information in a machine-readable way.

Usage:

vendor/bin/typo3 fluid:namespaces
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Example output:

+--------+------------------------------+
| Alias  | Namespace(s)                 |
+--------+------------------------------+
| core   | TYPO3\CMS\Core\ViewHelpers   |
+--------+------------------------------+
| formvh | TYPO3\CMS\Form\ViewHelpers   |
+--------+------------------------------+
| f      | TYPO3Fluid\Fluid\ViewHelpers |
|        | TYPO3\CMS\Fluid\ViewHelpers  |
+--------+------------------------------+
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The same information is also available in the Configuration module in the TYPO3 backend.

Impact 

The new console command allows developers and integrators to inspect registered global ViewHelper namespaces in the current project.