Improve Logging of SPPMon and SPPCheck / Introduce exception serverity

[NielsKorschinsky]

Is your feature request related to a problem? Please describe.

The logging of SPPMon and especially SPPCheck lacks clarity.
If a metric fails or SPPMon has collection errors, always multiple lines are issued due to the hierarchical exception system.
Also, some errors are more severe than others, with some, but not total relation to their hierarchical level.

Describe the solution you'd like

• Introduce exception severity to the logger, allowing to declare which exceptions are critical and which are more of a warning
• Re-work the print of the exceptions to make them more understandable
• Summary at the very end with a distinction between exception serveries.
• Interaction with the --debug and --verbose modes

Describe alternatives you've considered

Additional context