bug #19724 [Console] Register terminal env variables (ogizanagi)

This PR was merged into the 3.2-dev branch.

Discussion
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[Console] Register terminal env variables

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #19719
| License       | MIT
| Doc PR        | -

Solves #19719 by setting `COLUMNS` & `LINES` env vars when running an Application.
Those env vars are then meant to be reused when using the Process component.

~~It creates a new `Terminal::registerEnv()` method allowing to register terminal related informations into environment variables. ~~It allows getting "consistent terminal informations" across processes.~~

Unless the env vars handling is backported from the 3.2 `Terminal` class to older branches in the `Application` class, the mentioned issue can't be solved this way.

Commits
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926bc51 [Console] Register terminal env variables

src/Symfony/Component/Console/Application.php

@@ -104,6 +104,9 @@ public function setDispatcher(EventDispatcherInterface $dispatcher)
      */
     public function run(InputInterface $input = null, OutputInterface $output = null)
     {
+        putenv('LINES='.$this->terminal->getHeight());
+        putenv('COLUMNS='.$this->terminal->getWidth());
+
         if (null === $input) {
             $input = new ArgvInput();
         }