Add benchmark tests for Sum Aggregation #1949

[lalitb]

Fixes #1949

Changes

• Add benchmark tests for Sum Aggregation
  • Generate 100000 measurements, sleeping for 2ns after every 500 measurements.
  • Collect metrics in-between after generating 1000 measurements, and then in the end.
• Also modified Histogram Aggregation benchmark to generate similar measurements. It was earlier generating only one measurement.
• Created a common utils file containing mock classes used across most of the unit-tests.

The benchmark result for Sum Aggregation ( ~57ms to process 100000 measurement, along with collection 100 metrics collection)

$ ./sum_aggregation_benchmark
2023-02-01 00:18:41
Running ./sum_aggregation_benchmark
Run on (20 X 2808.01 MHz CPU s)
CPU Caches:
  L1 Data 32K (x10)
  L1 Instruction 32K (x10)
  L2 Unified 256K (x10)
  L3 Unified 20480K (x1)
Load Average: 3.65, 1.14, 1.55
------------------------------------------------------------
Benchmark                  Time             CPU   Iterations
------------------------------------------------------------
BM_SumAggregation   57306062 ns     57233754 ns           13

The benchmark result for Histogram Aggregation ( ~66ms to process 100000 measurement, along with collection 100 metrics collection)

$ ./histogram_aggregation_benchmark
2023-02-01 00:19:43
Running ./histogram_aggregation_benchmark
Run on (20 X 2808.01 MHz CPU s)
CPU Caches:
  L1 Data 32K (x10)
  L1 Instruction 32K (x10)
  L2 Unified 256K (x10)
  L3 Unified 20480K (x1)
Load Average: 1.34, 0.93, 1.45
------------------------------------------------------------------
Benchmark                        Time             CPU   Iterations
------------------------------------------------------------------
BM_HistogramAggregation   66169891 ns     66106382 ns           11

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1948 (35e430c) into main (5c121cf) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1948   +/-   ##
=======================================
  Coverage   87.29%   87.29%           
=======================================
  Files         166      166           
  Lines        4662     4662           
=======================================
  Hits         4069     4069           
  Misses        593      593           

[esigo]

LGTM
Thanks for the PR :)