Create custom intl twig functions

[franmomu]

Subject

There are conflicts using the last version of this bundle and SonataIntlBundle because both register twig functions with the same name and different signature.

The only way I could come up with is removing twig/extra-bundle, so the IntlExtension from twig/intl-extra is not automatically registered anymore and I created our IntlExtension which decorates the Twig one and exposes only the methods we're using changing their names to sonata_*.

The problem I see now is people using these functions in their projects and we should remove the in the next major version since this is a patch to make it work with sonata/intl-bundle. Don't know if there is a way to make twig functions as internal or something like that.

I am targeting this branch, because this is BC.

Closes sonata-project/SonataIntlBundle#299

Changelog

### Removed
- `twig/extra-bundle` dependency
### Fixed
- Compatibility with `sonata/intl-bundle`

To test:

composer config repositories.franmomu vcs https://github.com/franmomu/SonataAdminBundle
composer require sonata-project/admin-bundle "dev-allow_intl_extension as 3.62.1"

[core23]

Can you please try to extract some small methods. This will improve readability.

[phansys]

Great job @franmomu!
IMO, there is a missing part yet. The Twig functions at "sonata-project/intl-bundle" are using helpers to infer the locale and the timezone, in order to provide these values as arguments for the Intl core methods.
If those values are not passed anymore, the results will be different where the values were different than the default.
In that case, the users will be forced to update their codebase in order to provide these values manually each time the functions are called.

[franmomu]

Taking a look at this, we would need to import all the Timezone and Locale classes. Add the timezone configuration to AdminBundle and in case in the SonataIntlBundle is enabled and there is no configuration in SonataAdminBundle, it should use the SonataIntlBundle one to be BC. And also decide what to do with UserBasedTimezoneDetector.

So... at this point I don't know if it's better to just revert #5835 and make all these changes in master or keep patching things.

[phansys]

So... at this point I don't know if it's better to just revert #5835 and make all these changes in master or keep patching things.

The revert of #5835 has my vote 👍

[SonataCI]

Could you please rebase your PR and fix merge conflicts?