Update validation regex for command names & options

[IlluminatiFish]

✨ Summary

Update validation regex for command names & options, to now support localized command names & options.
This is an adaptation of Discord's suggested Perl-like regex ^[-_\p{L}\p{N}\p{sc=Deva}\p{sc=Thai}]{1,32}$ as Python's re module does not support unicode character properties

📝 Checklist

• If code changes were made then they have been tested.
• This PR fixes an issue.
• This PR is a breaking change (e.g. methods or parameters removed/renamed)

[codecov]

Codecov Report

Merging #1309 (99ebe2c) into master (fe5803f) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 99ebe2c differs from pull request most recent head 61fa025. Consider uploading reports for the commit 61fa025 to get more accurate results

@@           Coverage Diff           @@
##           master    #1309   +/-   ##
=======================================
  Coverage   33.42%   33.42%           
=======================================
  Files          93       93           
  Lines       17606    17606           
=======================================
  Hits         5885     5885           
  Misses      11721    11721           

Flag	Coverage Δ
pytest	33.42% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
discord/commands/core.py	17.75% <0.00%> (ø)

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[Middledot]

The regex should also be put in the comment on line 1619, otherwise the regex seems to work

[IlluminatiFish]

The regex should also be put in the comment on line 1619, otherwise the regex seems to work

There you go ;)