[Analyzer] Documentation - Score System

[olha23]

We need to add information about how we count the Trace Analyzer Score. Because it is not clear to everyone where we get this number.
Need to add here:
https://docs.tracetest.io/concepts/tracetest-analyzer-concepts/
https://docs.tracetest.io/configuration/tracetest-analyzer/

[xoscar]

@adnanrahic we updated the score system to be more flexible, I'm going to write something down about it, maybe after that would be nice if we could add it to our official docs