move usage towards AsChar method instead of functions under the character module

[Geal]

this reduces duplication a bit

the implementation comes from:

• fix!: Remove character::is_* in favor of AsChar  winnow-rs/winnow#2
• fix: Deprecate character::is_* functions winnow-rs/winnow#25

[coveralls]

Pull Request Test Coverage Report for Build 3807373087

• 0 of 16 (0.0%) changed or added relevant lines in 1 file are covered.
• 10 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.8%) to 60.825%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/traits.rs	0	16	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/character/mod.rs	10	0%

Totals
Change from base Build 3796683738:	-0.8%
Covered Lines:	1489
Relevant Lines:	2448

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 61.43%. Comparing base (cea6595) to head (6303c74).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/traits.rs	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1597      +/-   ##
==========================================
- Coverage   62.14%   61.43%   -0.72%     
==========================================
  Files          24       24              
  Lines        2922     2938      +16     
==========================================
- Hits         1816     1805      -11     
- Misses       1106     1133      +27     

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[codspeed-hq]

CodSpeed Performance Report

Merging #1597 will not alter performance

_{Comparing epage-aschar (6303c74) with main (cea6595)}

Summary

✅ 24 untouched benchmarks