Initial commit for plugin internals refactor

[Schamper]

Initial commit for the plugin internals refactor. This removes a lot of slow and hard to understand code with (hopefully) faster and easier to understand code. Also fixes some consistency issues I came across while working on this.

There are some things I want to add, but I may do those in a separate PR:

• Re-add support for Nested namespaces do not work #758 (it was lost in between version 2 and 3)
• Add support for "plugin directories", similar to _os.py, but then _plugin.py or something similar (Add support for plugin directories #788)
• Add helper functions for getting runtime information from functions, e.g. the class object, the record descriptor objects, etc. This will finally allow us to query plugins by e.g. ones that generate records that have a path field, for example.

This should also cover #759.

Closes #889.

[codecov]

Codecov Report

Attention: Patch coverage is 85.64516% with 89 lines in your changes missing coverage. Please review.

Project coverage is 75.50%. Comparing base (6968253) to head (e830c4e).

Files	Patch %	Lines
dissect/target/plugin.py	88.73%	41 Missing ⚠️
dissect/target/target.py	74.64%	18 Missing ⚠️
dissect/target/tools/query.py	72.72%	12 Missing ⚠️
dissect/target/helpers/docs.py	85.36%	6 Missing ⚠️
dissect/target/plugins/general/plugins.py	86.84%	5 Missing ⚠️
dissect/target/tools/build_pluginlist.py	0.00%	3 Missing ⚠️
dissect/target/tools/utils.py	81.25%	3 Missing ⚠️
dissect/target/plugins/os/windows/registry.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #763      +/-   ##
==========================================
- Coverage   75.51%   75.50%   -0.02%     
==========================================
  Files         305      305              
  Lines       26348    26295      -53     
==========================================
- Hits        19897    19853      -44     
+ Misses       6451     6442       -9     

Flag	Coverage Δ
unittests	75.50% <85.64%> (-0.02%)	⬇️

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