Add support for pushing custom events to the Event Log with sexy mode

Currently, new exceptions caught by the Winter error handler get pretty event log pages, it would be nice to support users doing so as well.

You can achieve this via:

Log::error($message, array_merge(
    (new EventLog())->getDetails(new \Exception()),
    [
        'exception' => [
            'type' => 'HttpError',
            'message' => $message,
            'code' => $response->code,
            'file' => __FILE__,
            'line' => __LINE__ - 8,
            'snippet' => explode(PHP_EOL, $snippet),
            'stringTrace' => $snippet,
            'trace' => [],
            'previous' => null
        ],
    ]
));

Which ends up looking like this:

This is not really ideal, maybe we can think of something better like:

Log::prettyError($message, [
    // details...
]);

But nicer :)

The issue names Winter's error handler, EventLog::getDetails(), and Log; start by tracing how caught exceptions become pretty Event Log pages. Define a supported way for callers to supply custom exception details, then verify those events render with the same page treatment without requiring manual payload construction.