Add thresholds to each request

[JavierUhagon]

This PR adds an argument to each request to add a threshold to it, if a request response time is over the threshold it'll be logged

This also adds a new stat in the webui (the threshold) that's hidden if there are no thresholds defined.

Images

Related issue: #2668

I want to know if @cyberw thinks this can be added to the core (and it's being done nicely) before I resume my work on it!

[cyberw]

Hi! I do see the point in having this, but complicating HttpSession in for what is kind of a rare case doesnt make sense, it needs to be a subclass or something (side note: what are those print statements about? :)

[JavierUhagon]

Hi! I do see the point in having this, but complicating HttpSession in for what is kind of a rare case doesnt make sense, it needs to be a subclass or something (side note: what are those print statements about? :)

I think a subclass would make sense, yeah, this is just a draft, whenever the PR is ready for review I'll remove the print statements! :)

Kk, I'll work on that and @ you whenever it's ready!

[JavierUhagon]

@cyberw I've added a new HttpSession subclass for this, and to use this there is a new HttpUser, if you think this can or should be done differently let me know!