chore: add performance test script

[junha-ahn]

What is this PR?

• Github Issue: #83

Key Changes

• add k6 scripts
• add auth db init
• it runs on docker-compose
• print(stdout) dashboard link

  Test Checklist

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (15d6b8b) 81.79% compared to head (1109514) 81.79%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #84 +/- ## ========================================= Coverage 81.79% 81.79% Complexity 121 121 ========================================= Files 36 36 Lines 467 467 Branches 27 27 ========================================= Hits 382 382 Misses 62 62 Partials 23 23 ```

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