Add AD1 and ADCRYPT implementations

[JSCU-CNI]

This PR fixes the AD1 implementation and adds support for rudimentary ADCRYPT decryption using the cli tool adecrypt (#37, #38). Also restructured the project and tests a bit.

[Schamper]

I still haven't looked in much detail at the actual parsing, but these comments are quite big again. Let me know if I can be of any help resolving them.

[Schamper]

I've made some changes, let me know if you agree.

[codecov]

Codecov Report

❌ Patch coverage is 88.95349% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.44%. Comparing base (971b899) to head (f5db15a).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/evidence/ad1/ad1.py	90.42%	25 Missing ⚠️
dissect/evidence/adcrypt/adcrypt.py	84.48%	9 Missing ⚠️
dissect/evidence/tools/adcrypt.py	81.25%	9 Missing ⚠️
dissect/evidence/tools/util.py	57.14%	9 Missing ⚠️
dissect/evidence/adcrypt/stream.py	88.46%	3 Missing ⚠️
dissect/evidence/ad1/stream.py	97.95%	1 Missing ⚠️
dissect/evidence/tools/asdf/repair.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   63.17%   71.44%   +8.27%     
==========================================
  Files          11       23      +12     
  Lines        1013     1387     +374     
==========================================
+ Hits          640      991     +351     
- Misses        373      396      +23     

Flag	Coverage Δ
unittests	71.44% <88.95%> (+8.27%)	⬆️

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[JSCU-CNI]

I've made some changes, let me know if you agree.

Thank you for the applied changes, especially the ADCRYPT and stream implementations. Will take a look at the companion PR in dissect.target to make unlock work with the keychain.