feat(python): Add Series .str.escape_regex()

[cmdlineluser]

Just noticed the new Expr.str.escape_regex() did not yet have an entry In the Series dispatch code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.03%. Comparing base (69c9c3a) to head (185229e).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19419      +/-   ##
==========================================
- Coverage   80.03%   80.03%   -0.01%     
==========================================
  Files        1532     1532              
  Lines      210749   210750       +1     
  Branches     2442     2442              
==========================================
- Hits       168676   168675       -1     
- Misses      41518    41520       +2     
  Partials      555      555              

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[ritchie46]

Good catch. Thanks!