[feat] From performance logger to result logger

[Lewih]

Closes #2853.

As discussed also on Slack, performance loggers should log a test record for any kind of test.
This PR has the purpose to discuss and develop this feature.

Checklist:

• Extend the output of perflog_handlers (e.g. httpjson and filelog) to tests not performing the performance stage.
• Check that the log record content is correct for every kind of test.
• Rename "performance loggers" to "result loggers" (or alternative name).
• Update Config Schema
• Update the tests.
• Update the documentation.

The first commit should tackle the first point.

[jenkins-cscs]

Can I test this patch?