Add changelog fragments for ChannelTuple and driver improvements

[Copilot]

• Changelog
• Tests

Changes

Adds type-safe multi_parameter and multi_function methods to ChannelTuple class for accessing parameters/functions across all channels with proper type information.

Adds explicit type annotations to channels submodule in drivers:

• RohdeSchwarzZNBBase
• MiniCircuitsRCSPDT
• TektronixTPS2012

Example usage

# Type-safe parameter access
temp_param = dci.channels.multi_parameter("temperature")
temperatures = temp_param.get()  # Returns tuple of all channel temperatures

# Type-safe function access  
multi_func = dci.channels.multi_function("autoscale")
multi_func()  # Calls autoscale on all channels

Changelog entries

• 7686.improved - ChannelTuple multi_parameter/multi_function methods
• 7686.improved_driver - Driver type annotation improvements

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.79%. Comparing base (3614d2f) to head (fac9a7d).
⚠️ Report is 7 commits behind head on jenshnielsen/add_channel_type.

Additional details and impacted files

@@                        Coverage Diff                        @@
##           jenshnielsen/add_channel_type    #7688      +/-   ##
=================================================================
+ Coverage                          58.82%   59.79%   +0.96%     
=================================================================
  Files                                352      352              
  Lines                              31681    31681              
=================================================================
+ Hits                               18637    18944     +307     
+ Misses                             13044    12737     -307     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

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