N°8771 - Add Symfony form component to iTop core (#760)

- Add Symfony Form Component
- Add Symfony CSRF security component
- Add iTop default form template
- Add Twig debug extension to Twig Environment
- Add iTop abstract controller facility to get form builder
- Add Twig filter to make trans an alias of dict_s filter

lib/symfony/security-csrf/README.md

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+Security Component - CSRF
+=========================
+
+The Security CSRF (cross-site request forgery) component provides a class
+`CsrfTokenManager` for generating and validating CSRF tokens.
+
+Sponsor
+-------
+
+The Security component for Symfony 6.4 is [backed][1] by [SymfonyCasts][2].
+
+Learn Symfony faster by watching real projects being built and actively coding
+along with them. SymfonyCasts bridges that learning gap, bringing you video
+tutorials and coding challenges. Code on!
+
+Help Symfony by [sponsoring][3] its development!
+
+Resources
+---------
+
+ * [Documentation](https://symfony.com/doc/current/components/security.html)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/backers
+[2]: https://symfonycasts.com
+[3]: https://symfony.com/sponsor