Drupal 10 compatibility fixes

I am getting this error when installing the errorlog module:

Fatal error: Declaration of Drupal\errorlog\Logger\ErrorLogMessageFormatter::log($level, $message, array $context = []) must be compatible with Drupal\Core\Logger\RfcLoggerTrait::log($level, Stringable|string $message, array $context = []): void in /var/www/html/web/modules/contrib/logging_alerts/errorlog/src/Logger/ErrorLogMessageFormatter.php on line 46

Attached a patch to fix this.

The above patch #4 applied cleanly is compatible with d10 , it can install the module without any issue, attached screenshot for the same

I merged two other issues, so moving this to Needs Work.

We can finish the D10 compatibility issues from what is left here. If possible, we should keep D9 compatibility as well. Thanks!

I plan to publish the release once this issue is fixed.

Seems like that all that is left from the original changes in this MR is to change the core_version_requirement and some other minor adjustments. So let's fix this. I have removed the newly added composer.json - we can still add it later, but I do not think we need it now (the file is not needed in certain circumstances: https://www.drupal.org/docs/develop/using-composer/add-a-composerjson-file).

I have also changed core_version_requirement from ^8 to ^8.8, as per: https://www.drupal.org/node/3070687 . I do not see any other D10 incompatibilities in the issue queue now, so going to commit this change.