[Perfstress] Multiprocess support

[annatisch]

Fixes #16121

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[mikeharder]

Issue that can be fixed after this PR is merged:

#24194 [Perf] Invalid intermediate results when using multiple processes

[ghost]

Hi @annatisch. Thank you for your interest in helping to improve the Azure SDK experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment. Otherwise, we'll close this out in 7 days.

[ghost]

Hi @annatisch. Thank you for your interest in helping to improve the Azure SDK experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment. Otherwise, we'll close this out in 7 days.

[mikeharder]

Ping to keep PR alive

[pvaneck]

Awesome! Definitely noticed a great improvement in Python performance numbers now that cores are utlized. I left some comments inline.

[pvaneck]

Looks good and the updated docs are quite helpful! Only a few minor typos.

[pvaneck]

Looks like cspell has more complaints:

##[error]./doc/dev/perfstress_tests.md:4:33 - Unknown word (perfstresstest)
##[error]./doc/dev/perfstress_tests.md:5:32 - Unknown word (batchperftest)
##[error]./doc/dev/perfstress_tests.md:124:15 - Unknown word (cumultive)
##[error]./doc/dev/perfstress_tests.md:129:15 - Unknown word (cumultive)
##[error]./doc/dev/perfstress_tests.md:161:20 - Unknown word (sychronous)
##[error]./doc/dev/perfstress_tests.md:168:20 - Unknown word (asychronous)
##[error]./doc/dev/perfstress_tests.md:256:27 - Unknown word (ancilliary)
##[error]./doc/dev/perfstress_tests.md:266:27 - Unknown word (ancilliary)
##[error]./doc/dev/perfstress_tests.md:292:32 - Unknown word (streamperftests)

s/ancilliary/ancillary
Then I suppose we can just hyphenate the example container name to make cspell happy: s/streamperftests/stream-perf-tests