perf: Arroyo 2.15.0 and reusable multiprocessing pools

[lynnagara]

Contains perf improvements for rebalancing

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (38d04d6) 90.68% compared to head (a83e5e2) 90.64%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
snuba/consumers/consumer.py	66.66%	2 Missing ⚠️
snuba/consumers/strategy_factory.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5170      +/-   ##
==========================================
- Coverage   90.68%   90.64%   -0.05%     
==========================================
  Files         862      862              
  Lines       42061    42072      +11     
  Branches      288      288              
==========================================
- Hits        38144    38137       -7     
- Misses       3875     3893      +18     
  Partials       42       42              

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ FileNotFoundError: [Errno 2] No such file or directory: '/psm_9ae1776a' [cli init] consumer View Issue
• ‼️ FileNotFoundError: [Errno 2] No such file or directory: '/psm_c7d456d8' [cli init] consumer View Issue

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[getsentry-bot]

PR reverted: 1950498