keeping timeseries and points in order after aggregation in metrics transform processor

[JingboWangGoogle]

Description: This update to the metrics transform processor would keep the timeseries and points ordered by timestamp

Link to tracking Issue: #332

[codecov]

Codecov Report

Merging #663 into master will increase coverage by 0.00%.
The diff coverage is 72.72%.

@@           Coverage Diff           @@
##           master     #663   +/-   ##
=======================================
  Coverage   86.31%   86.31%           
=======================================
  Files         196      196           
  Lines       10754    10765   +11     
=======================================
+ Hits         9282     9292   +10     
- Misses       1136     1137    +1     
  Partials      336      336           

Flag	Coverage Δ
#integration	71.09% <ø> (ø)
#unit	86.15% <72.72%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...cstransformprocessor/operation_aggregate_labels.go	90.32% <0.00%> (-9.68%)	⬇️
...metricstransformprocessor/datapoint_aggregation.go	100.00% <100.00%> (ø)
...stransformprocessor/metrics_transform_processor.go	100.00% <100.00%> (ø)
...sformprocessor/operation_aggregate_label_values.go	100.00% <100.00%> (ø)
receiver/carbonreceiver/transport/tcp_server.go	67.61% <0.00%> (+1.90%)	⬆️

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