docs: translate and create Japanese version

[yhay81]

trafficstars

Resolve #425

I am not sure if adding Japanese documentation will increase maintenance costs.　Please review and decide if this is manageable. (I have standardized the term "state-of-the-art" as "最先端の" across the README and other documents.)

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 28, 2024 2:10pm

[codecov-commenter]

Codecov Report

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

Project coverage is 99.77%. Comparing base (d02ef35) to head (6b4eff1). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #432   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files         165      165           
  Lines        1325     1325           
  Branches      357      357           
=======================================
  Hits         1322     1322           
  Misses          2        2           
  Partials        1        1