Add an optional parameter to Envelope which would skip MAC verification

[EmilienCourt]

Hi,

As stated in #40, I would like to add an optional parameter, defaulting to True, which would allow me to use dissect.hypervisor as a library and skip the cipher.verify from the Envelope's class.

In my opinion this would not change the upstream code and not introduce any vulnerability, as this defaults to True.

Regards :)

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[EmilienCourt]

@DissectBot agree

[Schamper]

Just some small conciseness changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.61%. Comparing base (e5b198b) to head (cbf8a38).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   61.58%   61.61%   +0.03%     
==========================================
  Files          27       27              
  Lines        2353     2355       +2     
==========================================
+ Hits         1449     1451       +2     
  Misses        904      904              

Flag	Coverage Δ
unittests	61.61% <100.00%> (+0.03%)	⬆️

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