ci: compare bundle size

[EdamAme-x]

The author should do the following, if applicable

• [ ] Add tests
• [x] Run tests
• [x] bun run format:fix && bun run lint:fix to format the code
• [ ] Add TSDoc/JSDoc to document the code

[EdamAme-x]

if this pr is merged, before.js will also be output to show the change in bundle size.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.70%. Comparing base (7e17b76) to head (3aef3ae). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3661 +/- ## ======================================= Coverage 91.69% 91.70% ======================================= Files 159 159 Lines 10138 10145 +7 Branches 2976 2908 -68 ======================================= + Hits 9296 9303 +7 Misses 840 840 Partials 2 2 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[EdamAme-x]

Hi @m-shaka, could you please check this?

[yusukebe]

Hi @k2tzumi! Can you review this, you too?

[EdamAme-x]

what happen, DDoS...?

[EdamAme-x]

hi @yusukebe, this pr should be ready.

[EdamAme-x]

It would be nicer if you could see a unit(like KB or MB) of bundle size, but it's OK to add it later

Agreed!
We will add custom metrics later, so it seems like a good idea to add them at that time.

[yusukebe]

@EdamAme-x @k2tzumi @m-shaka

Thank you all! Let's go with this.