[FEATURE] Correct Labels on Jaeger mode to follow RED metrics standard and add Duration mode for dashboard

[derek-ho]

Is your feature request related to a problem?
In order to follow the RED metrics standard for traces, rename latency -> duration and error rate -> errors. Additionally we need to add a "duration" toggle to follow RED metrics completely. We need to decide which core stats should be present on all of the modes, and which are mode specific (or as much info as possible present on all modes). Additionally, we need to decide what will fill the main graph of the "duration" mode -> will it be average duration? Average duration of the top 5 slowest service/operation combos? This should be clear to the user

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[derek-ho]

@kavck / Nitin, please add some comments here regarding the open questions to solve this issue

[derek-ho]

#284