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 75.62%. Comparing base (a9d723b) to head (750d186).
Report is 15 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   75.40%   75.62%   +0.21%     
==========================================
  Files         302      312      +10     
  Lines       26152    26577     +425     
==========================================
+ Hits        19720    20098     +378     
- Misses       6432     6479      +47     

Flag	Coverage Δ
unittests	75.62% <97.29%> (+0.21%)	⬆️

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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.