Add handler to capture log lines and send them to Sentry as Issues

[Litarnus]

Problem Statement

We want to deprecate Monolog\Handler but this means that converting log messages with a certain level to Sentry Issues will no longer work. For people using Sentry logs, this might be a non issue but if someone is not using Logs, the removal feels like they have to do more work to set up alerts and get a similar functionality.

Solution Brainstorm

Add a handler that just converts log messages with a certain level to issues. Give it a proper name like LogToSentryIssueHandler so that it's clear it only does one thing. Avoid adding more functionality and generic names to not repeat the mistake of Monolog\Handler.

If exception -> issue and log -> issue is desired, the solution would be to have two handlers, each handling their respective part

Origin: #2051 (comment)

[linear-code]

PHP-78

[mrtus]

We are actually in need of the same here. I entirely missed this path as well on previous discussion. But (error) log to issues would be a requirement for us too, this is now still an issue for us as we cannot fully replace the deprecated handler yet in most of our services.

[Litarnus]

@mrtus we just shipped 4.26.0 which contains the LogToSentryIssueHandler. Please give it a try and let me know if you notice something off