Add focused benchmark for metric hotpath

[cijothomas]

I understand we have a lot of benchmarks, but I wanted to add something very focused, to help with PRs like #1379 (and its many follow ups).

Also added dedicated one for AttributeSet creation costs for various scenarios.

It okay to nuke these once the perf improvements are done, but I hope this is very useful to quickly measure PRs impact.
I was able to use this with #1379, and was able to quickly see the improvement.

[cijothomas]

@KallDrexx I used this benchmarks against 1379. And here is my results (~16% boost). Could you check if you see similar?

Counter_Add_Sorted      time:   [839.97 ns 853.31 ns 869.54 ns]
                        change: [-16.163% -13.860% -11.672%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
  6 (6.00%) high mild
  2 (2.00%) high severe

Counter_Add_Unsorted    time:   [832.49 ns 840.25 ns 848.39 ns]
                        change: [-13.431% -11.739% -10.075%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
  1 (1.00%) high mild
  1 (1.00%) high severe

[lalitb]

The benchmark result of the test on my machine (~ 20% boost):

for main branch:

Counter_Add_Sorted      time:   [1.1975 µs 1.1985 µs 1.1996 µs]
Counter_Add_Unsorted    time:   [1.2020 µs 1.2041 µs 1.2076 µs]

for #1379 PR:

Counter_Add_Sorted      time:   [959.58 ns 963.14 ns 968.10 ns]
Counter_Add_Unsorted    time:   [965.16 ns 966.00 ns 966.89 ns]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3229979) 57.2% compared to head (0ebe723) 57.2%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1389   +/-   ##
=====================================
  Coverage   57.2%   57.2%           
=====================================
  Files        146     146           
  Lines      18128   18128           
=====================================
+ Hits       10371   10372    +1     
+ Misses      7757    7756    -1     

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[lalitb]

LGTM.

[cijothomas]

Merging now, as to leverage this for the pending PRs. Happy to address any additional feedbacks as followups.