Allow options to be provided to Doctrine

[summersab]

• Resolves: Allow additional config parameters for Doctrine #40447
• Would also resolve Add events to QueryBuilder class #36572 by allowing for custom middlewares and driver wrappers

Summary

This allows additional options, configurations, and middlewares to be provided to Doctrine when the DB connection is established.

NOTES

• Two new optional settings were created in config.php: dbconnectionparams and dbconfigurationparams. I had considered appending these to the existing dbdriveroptions, but these settings are distinctly different. So, I created new settings.
• In OC\AppFramework\App:
  • The method getAppIdForClass() was incomplete. The function isn't used by anything else, at present
  • The method registerAppClass was added to allow app classes to be registered prior to actually loading the apps. This is because custom classes must be provided when defining middlewares, custom loggers, etc, but any classes provided by an app aren't available when the DB connection is established. This allows an app's classes to be registered in an out-of-band way
  • A modified version of OC\App\AppManager::getAppInfo was added instead of using the existing class and method. This is because the DB connection must exist in order to load the AppManager, leading to a race condition.
  • Code was added to OC\DB\ConnectionFactory in order to load the options from config.php, ensure that any custom classes are loaded (using the previously-mentioned methods), and apply the options provided.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)