Add stats panel
This MR adds and modifies a few panels:
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Receiver work share is shown over all receivers, while other panel shows the value per receiver instance.
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Statistics shows average time from Receiver operations (total request time will come later), broker and file transfer service
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Add data transfer rate and message rate from from Receiver data-server (cache) and file-transfer server (reading data from file).
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Table of Recent streams shows the LAST entries for given data_source and groupId, which corresponds to the last processed stream in given data_source.
It is rather easy to change panels later, therefore I would rather focus on missing information. That would require to change asapo code, that I would suggest in the next MRs.