Lock on hislip

[hb020]

Preparing, this is to be applied AFTER #626

• Closes Allow locking on hislip #635
• Executed pre-commit with no errors
• The change is fully covered by automated unit tests
• Documented in docs/ as appropriate
• Added an entry to the CHANGES file

[codecov]

Codecov Report

❌ Patch coverage is 76.38484% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.04%. Comparing base (048df06) to head (d2bc3d7).

Files with missing lines	Patch %	Lines
pyvisa_py/protocols/hislip.py	59.53%	51 Missing and 19 partials ⚠️
pyvisa_py/tcpip.py	81.03%	3 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #643      +/-   ##
==========================================
+ Coverage   48.74%   51.04%   +2.30%     
==========================================
  Files          35       35              
  Lines        5814     6114     +300     
  Branches      573      614      +41     
==========================================
+ Hits         2834     3121     +287     
+ Misses       2930     2919      -11     
- Partials       50       74      +24     

Flag	Coverage Δ
unittests	51.04% <76.38%> (+2.30%)	⬆️

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[hb020]

HiSLIP transforms into open-with-lock into open-and-then-lock.

In view of the problems with DMM6500, we should maybe also move VXI-11 to that method, just like NI-VISA does it.