Keyword execution time analysis tool

[Muusssi]

Is your feature request related to a problem? Please describe.
TestArchiver collects statistics of the keywords and their running time and Currently there is no ways to browse that data in the tool.

Describe the solution you'd like
A simple list of the keywords in a build and aggregated data from the keywords statistics table in the test archive. The table should be ordered by how much of the total execution time was spent execution the keyword in descending order.

Describe alternatives you've considered
I did some prototyping with the keyword statistics data and this table was the most generic but almost always interesting and meaningful analysis of the data. Other more detailed or complex prototypes would have required more qualifiers for the included keywords and made the feature less generic and much more complex.

Additional context
This tool is supposed to be released for RoboCon and its prototype will be demoed in a lightning talk.

[Muusssi]

Prototype API for test/keyword performance analysis