Add registry abstraction layer to ease the manipulation of [MS-RRP] RPC

[Ebrix]

Checklist:

• If you are new to Scapy: I have checked CONTRIBUTING.md (esp. section submitting-pull-requests)
• I squashed commits belonging together
• I added unit tests or explained why they are not relevant
• The unit tests are part of the Scapy-Red project, they use the RPC.
• I executed the regression tests (using tox)
• If the PR is still not finished, please create a Draft Pull Request

The PR does 2 things :

• 1. create a "windows" folder to move windows related code (typically move Windows security objects from smb2 to windows/security.py)
• 2. add a registry.py file which gives "high" level abstraction of the ms_rrp.py RPC to allow the dev to easily interact with the RPC

Some import paths are modified

[codecov]

Codecov Report

❌ Patch coverage is 21.58895% with 454 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.28%. Comparing base (85825ed) to head (ab86a72).

Files with missing lines	Patch %	Lines
scapy/layers/windows/registry.py	0.00%	257 Missing ⚠️
scapy/layers/msrpce/raw/ms_rrp.py	0.00%	151 Missing ⚠️
scapy/layers/windows/security.py	71.61%	44 Missing ⚠️
scapy/layers/smbclient.py	50.00%	1 Missing ⚠️
scapy/modules/ldaphero.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4936      +/-   ##
==========================================
- Coverage   80.64%   80.28%   -0.36%     
==========================================
  Files         370      375       +5     
  Lines       91986    92410     +424     
==========================================
+ Hits        74180    74192      +12     
- Misses      17806    18218     +412     

Files with missing lines	Coverage Δ
scapy/layers/kerberos.py	58.66% <100.00%> (ø)
scapy/layers/ldap.py	67.11% <100.00%> (ø)
scapy/layers/msrpce/msnrpc.py	64.43% <100.00%> (+0.10%)	⬆️
scapy/layers/msrpce/mspac.py	90.78% <100.00%> (ø)
scapy/layers/msrpce/rpcclient.py	57.58% <100.00%> (ø)
scapy/layers/smb.py	76.78% <100.00%> (+0.08%)	⬆️
scapy/layers/smb2.py	90.28% <100.00%> (+1.86%)	⬆️
scapy/layers/smbserver.py	72.82% <100.00%> (+0.03%)	⬆️
scapy/layers/windows/__init__.py	100.00% <100.00%> (ø)
scapy/layers/windows/erref.py	100.00% <100.00%> (ø)
... and 6 more

... and 7 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gpotter2]

Thanks a lot for the PR and your interest in Scapy ! This is very cool work !!!!

I have minor comments, very picky, but overall it looks great 👍