Fix NamespacePlugin function filtering

[MaxGroot]

While working on #384, I ran into some issues with the NamespacePlugin.

• The previous check for subplugin export functions was too strict. It did not account for subplugins reusing export methods of subplugins.
• Also improved handling UnsupportedPlugin exceptions, in favour of handling any Exception with a continue.
• Lastly, added a check for when a subplugin has an export function with the same name as the NamespacePlugin subclass to which it belongs.
• Added tests for the scenarios outlined above.

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[MaxGroot]

@DissectBot agree

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (85ee955) 73.89% compared to head (b405a62) 73.88%.

Files	Patch %	Lines
dissect/target/plugin.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #463      +/-   ##
==========================================
- Coverage   73.89%   73.88%   -0.01%     
==========================================
  Files         271      271              
  Lines       22471    22476       +5     
==========================================
+ Hits        16605    16607       +2     
- Misses       5866     5869       +3     

Flag	Coverage Δ
unittests	73.88% <66.66%> (-0.01%)	⬇️

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Fixed