List ingress and egress separately on JSON and CSV exports. Include BW and also raw values per second

[filipecosta90]

The following PR:

• List ingress and egress separately on JSON and CSV exports.
• Include overall BW results in the JSON and CSV and also raw values per second in the JSON timeseries
• This PR is backwards compatible on the JSON output

excerpt from the json output showcasing the added overall metrics ("KB/sec RX/TX", "KB/sec RX", "KB/sec TX") and the per second ones ("Bytes RX","Bytes TX")

,"Gets":{
			"Count": 2000000
			,"Ops/sec": 311352.91
			,"Hits/sec": 311352.91
			,"Misses/sec": 0.00
			,"Latency": 0.643
			,"Average Latency": 0.643
			,"Min Latency": 0.008
			,"Max Latency": 5.183
			,"KB/sec": 20922.58
			,"KB/sec RX/TX": 20922.58
			,"KB/sec RX": 11858.17
			,"KB/sec TX": 9064.41
			,"Time-Serie":{
				"0":{
					"Bytes RX": 12263160
					,"Bytes TX": 9372271
					,"Count": 314440
(...)
(...)

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (912a6da) 62.22% compared to head (c1d08b5) 64.53%.

Files	Patch %	Lines
run_stats.cpp	57.69%	22 Missing ⚠️
run_stats_types.cpp	87.87%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
+ Coverage   62.22%   64.53%   +2.31%     
==========================================
  Files          21       21              
  Lines        4347     4368      +21     
==========================================
+ Hits         2705     2819     +114     
+ Misses       1642     1549      -93     

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