feat(tools): add API performance test tool

[hogo6002]

API perf test script:

• Retrieve all bugs from the datastore and write them into JSON files.
• Read bugs from the JSON files and generate queries randomly.
• Send the generated queries asynchronously to the test instance.

[andrewpollock]

This looks really cool!

To enhance the readability and maintainability of this, could you please:

• Expand the docstrings to include arguments and returns per https://google.github.io/styleguide/pyguide.html#s3.8.3-functions-and-methods
• Add type hints per https://google.github.io/styleguide/pyguide.html#s2.21-type-annotated-code

[another-rex]

Looks pretty good!

It would be good to add a script to generate the JSON file as well, and at least add a sample JSON file with a few entries so users know how to generate their own JSON file to test with.

[another-rex]

Just need to add the function argument types, and it should be good to merge!

Could be useful to store the results to use to verify behavior changes, but that can be a follow up later.