Make the PSR-3 adapter exception-aware

[ChristophWurst]

The PSR-3 logger does not have an equivalent method of our logException, but the specs were written with \Exceptions in mind, hence this is all taken care of: https://www.php-fig.org/psr/psr-3/#13-context.

I've thus changed our adapter so the exception serializer is used for exceptions logged through the PSR adapter.

A prettified exception from this logger:

{
"reqId": "HDJbNodBnIhn7sTisIbV",
"level": 0,
"time": "2020-07-14T07:43:14+00:00",
"remoteAddr": "",
"user": "--",
"app": "no app in context",
"method": "",
"url": "--",
"message": {
"Exception": "Exception",
"Message": "nonono",
"Code": 0,
"Trace": [
{
"file": "/home/christoph/workspace/nextcloud/lib/base.php",
"line": 643,
"function": "runRegistration",
"class": "OC\\AppFramework\\Bootstrap\\Coordinator",
"type": "->",
"args": []
},
{
"file": "/home/christoph/workspace/nextcloud/lib/base.php",
"line": 1087,
"function": "init",
"class": "OC",
"type": "::",
"args": []
},
{
"file": "/home/christoph/workspace/nextcloud/console.php",
"line": 49,
"args": [
"/home/christoph/workspace/nextcloud/lib/base.php"
],
"function": "require_once"
},
{
"file": "/home/christoph/workspace/nextcloud/occ",
"line": 11,
"args": [
"/home/christoph/workspace/nextcloud/console.php"
],
"function": "require_once"
}
],
"File": "/home/christoph/workspace/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php",
"Line": 81,
"Previous": {
"Exception": "Exception",
"Message": "ok cool",
"Code": 0,
"Trace": [
{
"file": "/home/christoph/workspace/nextcloud/lib/base.php",
"line": 643,
"function": "runRegistration",
"class": "OC\\AppFramework\\Bootstrap\\Coordinator",
"type": "->",
"args": []
},
{
"file": "/home/christoph/workspace/nextcloud/lib/base.php",
"line": 1087,
"function": "init",
"class": "OC",
"type": "::",
"args": []
},
{
"file": "/home/christoph/workspace/nextcloud/console.php",
"line": 49,
"args": [
"/home/christoph/workspace/nextcloud/lib/base.php"
],
"function": "require_once"
},
{
"file": "/home/christoph/workspace/nextcloud/occ",
"line": 11,
"args": [
"/home/christoph/workspace/nextcloud/console.php"
],
"function": "require_once"
}
],
"File": "/home/christoph/workspace/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php",
"Line": 81
},
"CustomMessage": "henlo"
},
"userAgent": "--",
"version": "20.0.0.0"
}

[rullzer]

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