title	issue	author	author_email	author_github
Remove core dependencies from ContextController	NEXT-21967	Stefan Sluiter	s.sluiter@shopware.com	ssltg

Core

Added Shopware\Core\Checkout\Customer\SalesChannel\AbstractChangeLanguageRoute
Added Shopware\Core\Checkout\Customer\SalesChannel\ChangeLanguageRoute
Added new store-api route /account/change-language
Changed \Shopware\Core\System\SalesChannel\SalesChannel\ContextSwitchRoute::switchContext to check return the new domain on language change.
Added getRedirectUrl to Shopware\Core\System\SalesChannel\ContextTokenResponse to hold the redirectUrl in a token change if necessary.

Storefront

Changed Shopware\Storefront\Controller\ContextController to use ChangeLanguageRoute and ContextSwitchRoute instead of repositories.
Deprecated ChangeLanguageRoute in Shopware\Storefront\Controller\ContextController. This will be removed in v6.5.0.0.
Deprecated the automatic change of the customers language on the change of the storefront language in \Shopware\Storefront\Controller\ContextController::switchLanguage