perf(backend): JSON.parse の呼び出しを削減する

[riku6460]

What

Redis から拾ったデータの JSON.parse の呼び出しを削減しました。

Why

Misskey.io のバックエンドをプロファイリングしたところ、JSON.parse が WebSocket のコネクション数だけ呼ばれていたため

Additional info (optional)

Tested on misskey.io

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

Merging #11091 (bd8754f) into develop (84d3a06) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop   #11091      +/-   ##
===========================================
- Coverage    77.33%   77.21%   -0.13%     
===========================================
  Files          907      737     -170     
  Lines        91480    70142   -21338     
  Branches      7546     7052     -494     
===========================================
- Hits         70748    54158   -16590     
+ Misses       20732    15984    -4748     

Impacted Files	Coverage Δ
...ackend/src/server/api/StreamingApiServerService.ts	88.33% <100.00%> (+0.40%)	⬆️

... and 171 files with indirect coverage changes

[syuilo]

👍🏻👍🏻

[tamaina]

CPU使用率が100%に張り付く時間が半減した感じがする