Add stress test scripts

[bhallasaksham]

Description of changes:

• Add stress test scripts that were used for testing v1.3.7 release with instructions on how to run them.

Testing done:

• Ran the scripts on my personal stack to create/delete kerberos leases and gMSA accounts as part of stress testing.

Merge Checklist

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[smhmhmd]

Added comments

[as14692]

Add example output for the stress tests

[bhallasaksham]

Add example output for the stress tests

@as14692 could you elaborate on this? Do you want me to paste the logs from cf_daemon or prints from execution of these python scripts? The logs/prints are pretty uninteresting, it'll just be a bunch of logs saying Created lease: XXXXXX, Deleted lease: XXXXXXX. The internal quip docs explain what and how to test so I can maybe link those quips here?