feat: add enable_insert_helpers configuration option

[haze]

WIP

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 78.51%. Comparing base (4efd646) to head (4b1a528).

Files	Patch %	Lines
src/features/completions.zig	92.30%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1870   +/-   ##
=======================================
  Coverage   78.50%   78.51%           
=======================================
  Files          34       34           
  Lines       10653    10661    +8     
=======================================
+ Hits         8363     8370    +7     
- Misses       2290     2291    +1     

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