chore: introduce i18next

[rot1024]

Overview

What I've done

• Introduce i18nnext
• Add a npm script: yarn i18n (so fast!!!)
• Rename gen:18n script to i18n:legacy
• Rename gen:gql script to gql (fewer type times)

What I haven't done

react-intl is not uninstalled yet. The number of translations is so large that it would be difficult to migrate them all at once, so we would like to rewrite them using i18next when we see react-intl when we revamp a component.

How I tested

Check Netlify preview to confrim the app continues to work

[netlify]

✅ Deploy Preview for reearth-web ready!

Name	Link
🔨 Latest commit	9ad251e
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😎 Deploy Preview	https://deploy-preview-212--reearth-web.netlify.app
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[codecov]

Codecov Report

Merging #212 (9ad251e) into main (9a59938) will increase coverage by 0.26%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
+ Coverage   43.70%   43.97%   +0.26%     
==========================================
  Files          60       63       +3     
  Lines        1350     1360      +10     
  Branches      227      228       +1     
==========================================
+ Hits          590      598       +8     
- Misses        698      699       +1     
- Partials       62       63       +1     

Impacted Files	Coverage Δ
src/i18n/legacy/locale.ts	85.71% <ø> (ø)
src/i18n/legacy/provider.tsx	75.00% <ø> (ø)
src/i18n/legacy/publishedProvider.tsx	50.00% <ø> (ø)
src/i18n/publishedProvider.tsx	0.00% <0.00%> (ø)
src/test/utils.tsx	100.00% <ø> (ø)
src/i18n/provider.tsx	83.33% <83.33%> (ø)
src/i18n/i18n.ts	100.00% <100.00%> (ø)

[KaWaite]

Reviewed!

[KaWaite]

Looks good!