benchmark: add support for memory profiling

[shawnh2]

What type of PR is this?

What this PR does / why we need it:

To help understanding memory, add memory profiles to benchmark report.

Which issue(s) this PR fixes:

xref: #3698

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.85%. Comparing base (2a86997) to head (9ebba16). Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3701      +/-   ##
==========================================
+ Coverage   68.55%   68.85%   +0.30%     
==========================================
  Files         170      175       +5     
  Lines       20690    21525     +835     
==========================================
+ Hits        14183    14821     +638     
- Misses       5492     5628     +136     
- Partials     1015     1076      +61     

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[shawnh2]

should wait https://github.com/envoyproxy/gateway/pull/3772, but close it for now, because too much conflicts, will re-raise another PR when https://github.com/envoyproxy/gateway/pull/3772 is landed.