Implement CLI command performance benchmark harness.

[aemous]

Description of changes:

• v1 port of the following v2 PRs:
  • Create benchmark harness using a stubbed HTTP client #9239
  • [v2] Benchmark harness improvements & add more service benchmarks #9264
• Differences from v2:
  • Replace use of AWSCLIEntryPoint with duplicating the contents of main() in awscli/clidriver.py since this class does not exist in v1.
  • In scripts/performance/benchmarks.json, replace usage of --no-cli-pager with setting cli_pager= in config to achieve the same result; this flag does not exist in v1.
  • In scripts/performance/benchmarks.json, remove the ddb.put benchmark, since this customization does not exist in v1.

Description of tests:

• Ran the script and observed expected output without errors.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.08%. Comparing base (c80a7d8) to head (c22f8ad).
Report is 59 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #9277   +/-   ##
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  Coverage     0.08%   0.08%           
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  Files          210     210           
  Lines        16984   16984           
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  Hits            14      14           
  Misses       16970   16970           

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