Add 'Trends' feature to compare runs

[enudler]

Is your feature request related to a problem? Please describe.
As a user, I would like to know if the last run of the test is better or worse than the previous one

Describe the solution you'd like
Upon the test finish, it should be compared to the previous runs of the same test with the same config, a trend should be added to the Report according to numerous params like

1. RPS
2. Latency
3. 2xx/3xx vs 4xx/5xx

This feature should be designed furthermore and is open for contribution.