🌐 Add Japanese translation for docs/ja/docs/advanced/events.md

[My-MC]

Relates to #1572

This PR is a translation of docs/ja/docs/advanced/events.md.

I'm Japanese. I like this framework so I translated it.

I am the first PR to this repository. I would appreciate a code review. Please let me know if it has any problems.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf73051) 100.00% compared to head (bccdd1e) 100.00%.

❗ Current head bccdd1e differs from pull request most recent head c179c23. Consider uploading reports for the commit c179c23 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            master     #5270    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          540       532     -8     
  Lines        13969     13684   -285     
==========================================
- Hits         13969     13684   -285     

see 34 files with indirect coverage changes

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[github-actions]

📝 Docs preview for commit bccdd1e at: https://62f84a3b4a1d0606dbc73077--fastapi.netlify.app

[tiangolo]

📝 Docs preview for commit c179c23 at: https://649a1242ec68df0f86e6b2db--fastapi.netlify.app

[tiangolo]

Thank you! I'm still waiting for others to review this to be able to merge it, meanwhile, maybe you could help me review some of the other Japanese translations, that way if they are approved by each other, I could merge them. 🤓

https://github.com/tiangolo/fastapi/issues?q=is%3Aopen+label%3Alang-ja+sort%3Aupdated-desc+label%3Aawaiting-review

[codespearhead]

@My-MC Do you happen to know three Japanese developers that you can ask a PR review from? This might help.