Add more security and allow_lists, and type annotations

[mraspaud]

This PR complements the previous work on curve security by enabling ZAP for all sockets (even unsecure, but will be transparent for existing processes), and using the white-listing also for the unsecure backend if defined.

[codecov]

Codecov Report

❌ Patch coverage is 86.00683% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.70%. Comparing base (5fe9b3f) to head (0bb8cdb).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
posttroll/backends/zmq/socket.py	70.11%	26 Missing ⚠️
posttroll/logger.py	0.00%	7 Missing ⚠️
posttroll/backends/zmq/subscriber.py	91.66%	4 Missing ⚠️
posttroll/backends/zmq/address_receiver.py	90.00%	1 Missing ⚠️
posttroll/backends/zmq/ns.py	97.72%	1 Missing ⚠️
posttroll/message.py	92.30%	1 Missing ⚠️
posttroll/ns.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   89.17%   88.70%   -0.48%     
==========================================
  Files          26       26              
  Lines        2430     2576     +146     
==========================================
+ Hits         2167     2285     +118     
- Misses        263      291      +28     

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