fix: use is_ascii_alphabetic

[discord9]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#4694

What's changed and what's your intention?

use is_ascii_alphabetic instead of is_alphabetic which checks for Other langauages' alphabet too(i.e: assert!('京'.is_alphabetic());

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.54%. Comparing base (a8477e4) to head (a1837df).
Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4698      +/-   ##
==========================================
- Coverage   84.81%   84.54%   -0.27%     
==========================================
  Files        1109     1109              
  Lines      200004   200010       +6     
==========================================
- Hits       169630   169097     -533     
- Misses      30374    30913     +539     

[discord9]

After though look into unicode standard(https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt) and mysql standard(https://dev.mysql.com/doc/refman/8.0/en/identifiers.html) and psql standard(https://www.postgresql.org/docs/current/sql-syntax-lexical.html), I found:

• unicode Char with Alphabetic property have too many of them(10052 in BMP(Basic Multilingual Plane) and 101539 if include Han&Hangul)
• mysql just support ascii char & the entire range of BMP
• psql support a-z, but also letters with diacritical marks and non-Latin letters

with all those complication, I think we better stick to is_alphabetic and correct upstream sqlparser's usage of is_alphabetic instead?

[discord9]

Rethinking this is_alphabetic is better than just allow all chars in BMP, so we can avoid column names like ，，， while accepting 一二三 so it's more useful