kernel: refactor FuncPRINT_CURRENT_STATEMENT

[fingolfin]

Move part of the code from the kernel to the library. This will make future improvements easier.

Co-authored-by: Codex codex@openai.com

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(Specifically, I have two follow-up PRs prepared that will further improve the stacktrace printing; it is easier to do that if as much of the code as possible is written in GAP.)

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.86%. Comparing base (74a43d6) to head (11f06b4).

Files with missing lines	Patch %	Lines
lib/error.g	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6424      +/-   ##
==========================================
- Coverage   78.86%   78.86%   -0.01%     
==========================================
  Files         685      685              
  Lines      293550   293547       -3     
  Branches     8672     8647      -25     
==========================================
- Hits       231515   231508       -7     
- Misses      60225    60230       +5     
+ Partials     1810     1809       -1     

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[lgoettgens]

I can have a look at this. Just request a review once CI passes

[fingolfin]

@lgoettgens thanks, I fixed it