Add support for runtime aliases to target_shell

[cecinestpasunepipe]

(DIS-2965)

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.31%. Comparing base (e1acf1a) to head (ad89a3e).

Files with missing lines	Patch %	Lines
dissect/target/tools/shell.py	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #871      +/-   ##
==========================================
+ Coverage   76.26%   76.31%   +0.05%     
==========================================
  Files         312      312              
  Lines       26790    26822      +32     
==========================================
+ Hits        20432    20470      +38     
+ Misses       6358     6352       -6     

Flag	Coverage Δ
unittests	76.31% <96.87%> (+0.05%)	⬆️

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[twiggler]

QA:

When entering the unknown command ee,

Actual I am getting the following error when entering an unknown command:

Expected:

*** Unknown syntax: ee

[twiggler]

@cecinestpasunepipe One small QA issue

When I run alias "./"="echo roel", the alias is defined (although it cannot be used yet):

Not that important but a bit weird.