Added support for MSSQL error log files

[fox-evv]

This can show e.g. that xp_cmdshell was enabled

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.34%. Comparing base (a899df6) to head (336d8f3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/os/windows/log/mssql.py	97.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   77.03%   74.34%   -2.69%     
==========================================
  Files         322      323       +1     
  Lines       27604    27641      +37     
==========================================
- Hits        21265    20551     -714     
- Misses       6339     7090     +751     

Flag	Coverage Δ
unittests	74.34% <97.29%> (-2.69%)	⬇️

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[Horofic]

Made some suggestions and added some tests with a commit. Please test in your own environment to see if the suggestions hold up.