With this commit we specify `level` in JVM logs. `level` helps to filter
more severe messages from mere debugging messages in logs and with this
change we are able to use it also for JVM logs.
Here are a few example lines:
Before:
```
[2022-12-15T06:19:16.936+0000][15181][gc,start ] GC(0) Pause Young (Normal) (G1 Evacuation Pause)
```
After:
```
[2022-12-15T06:22:27.932+0000][16320][info][gc,start ] GC(0) Pause Young (Normal) (G1 Evacuation Pause)
[2022-12-15T06:22:27.932+0000][16320][debug][gc,age ] GC(0) Desired survivor size 14680064 bytes, new threshold 15 (max threshold 15)
[2022-12-15T06:22:27.935+0000][16320][info ][gc,phases ] GC(0) Pre Evacuate Collection Set: 0.1ms
[2022-12-15T06:22:27.935+0000][16320][trace][gc,age ] GC(0) Age table with threshold 15 (max threshold 15)
```
Notice, that the log level might have trailing spaces.
See also
https://docs.oracle.com/en/java/javase/19/docs/specs/man/java.html#xlog-tags-and-levels
for the available log levels.
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