Default to real-utf8 when no charset is provided

[greg0ire]

Feature Request

Q	A
New Feature	yes
RFC	no
BC Break	no

Summary

Configuring charset in a portable way is a real pain for the community.
See e.g. symfony/recipes#674, which triggered symfony/recipes#689, then https://github.com/symfony/recipes/pull/691/files

This should be fixed by doctrine/DoctrineBundle#1070, but it would be great to have that default benefit to other consuming frameworks by contributing it directly here. When this is done, the code introduced in the bundle maybe be removed provided the composer constraint is adjusted.

[ostrolucky]

We should perhaps start with checking which databases don't already default to utf-8. MySQL was famous for defaulting to latin1_swedish_ci, but that's no longer true since MySQL 8.

[morozov]

Will be fixed by #4644.

[github-actions]

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