Optimize wildcard matching by converting SafeFNMatch_ to an iterative approach

[RadoslavPetkow]

Refactored SafeFNMatch_
Replaced the recursive implementation with an iterative approach to handle ‘*’ and ‘?’ wildcards. This change eliminates recursive call overhead and reduces potential stack usage, leading to improved performance in logging scenarios.
Maintained Behavior
The change preserves all existing semantics, ensuring that only the internal implementation of wildcard matching is affected.
Minor Code Cleanups
Made slight adjustments to pointer arithmetic and code formatting in functions such as VLOG2Initializer for improved clarity and robustness.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.51613% with 11 lines in your changes missing coverage. Please review.

Project coverage is 62.12%. Comparing base (6c5c692) to head (c868344).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/vlog_is_on.cc	64.51%	6 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1151      +/-   ##
==========================================
- Coverage   62.22%   62.12%   -0.10%     
==========================================
  Files          19       19              
  Lines        2324     2326       +2     
  Branches      845      843       -2     
==========================================
- Hits         1446     1445       -1     
- Misses        596      600       +4     
+ Partials      282      281       -1     

Files with missing lines	Coverage Δ
src/vlog_is_on.cc	60.74% <64.51%> (-2.11%)	⬇️

[sergiud]

Thanks for the PR.

It looks like the changes cause the demangle unit test to no longer pass on Linux. Could you please also split the SafeFNMatch_ unrelated refactorings and submit these in a separate PR?