Update phpstan.neon/phpcs.xml.dist

Jason Goserequested to merge
issue/link_magician-3584808:3584808-phpstan-and-phpcs into 1.0.x

Update phpstan.neon to include filesExtensions (same as the current drupal template) Add submodule composer.json for link_magician_paragraphs.

Closes #3584808

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