Add a panel accessor class for streamlit scripts to call

[mikeprosserni]

What does this Pull Request accomplish?

The PythonPanelService has two clients, the measurement script and the streamlit script. This PR is providing a new PanelAccessor class for the streamlit script to use to get/set values for controls. Unlike Panel, the PanelAccessor cannot open or close panels, it can only get and set values.

Note, I changed the available python versions of this project to exclude 3.9.7, because streamlit (which is now a dependency) doesn't work with 3.9.7.

Why should this Pull Request be merged?

Implements AB#3121341 - Create client library to connect Streamlit panel to Python Panel Service

What testing has been done?

Added new autotests

[github-actions]

Test Results

 10 files  ± 0   10 suites  ±0   9s ⏱️ ±0s
 27 tests + 3   27 ✅ + 3  0 💤 ±0  0 ❌ ±0 
240 runs  +30  240 ✅ +30  0 💤 ±0  0 ❌ ±0 

Results for commit 816d98d. ± Comparison against base commit 529bcda.

♻️ This comment has been updated with latest results.

[Copilot]

Pull Request Overview

Adds a generic panel accessor and streamlines Streamlit panel APIs while updating dependencies

• Introduce PanelAccessor and specialized StreamlitPanelAccessor to consolidate get/set logic
• Refactor StreamlitPanel to inherit from PanelAccessor and use a shared constant
• Bump Python requirement to 3.9.8 and add Streamlit dependency; update tests for the new accessor

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unit/test_streamlit_panel.py	Updated imports and added tests for StreamlitPanelAccessor
src/nipanel/_streamlit_panel_accessor.py	New StreamlitPanelAccessor class wrapping PanelAccessor
src/nipanel/_streamlit_panel.py	Refactored to inherit PanelAccessor and use STREAMLIT_PYTHON_PANEL_SERVICE
src/nipanel/_streamlit_constants.py	New constant for the Streamlit panel service interface
src/nipanel/_panel_accessor.py	New base class consolidating get/set value functionality
src/nipanel/_panel.py	Refactored Panel to subclass PanelAccessor, removed duplication
src/nipanel/init.py	Exported StreamlitPanelAccessor
pyproject.toml	Bumped Python to ^3.9.8 and added Streamlit >=1.24 dependency

Comments suppressed due to low confidence (3)

src/nipanel/_panel.py:7

• GrpcChannelPool is imported but unused in this file. Consider removing the import to keep the code clean.

from ni_measurement_plugin_sdk_service.grpc.channelpool import GrpcChannelPool

src/nipanel/_panel_accessor.py:22

• The constructor docstring only documents panel_id and grpc_channel. Please add entries for discovery_client and grpc_channel_pool to fully describe all parameters.

"""Create an accessor for a Streamlit panel.

src/nipanel/_panel.py:12

• The class references ABC but does not import it. Add from abc import ABC at the top of the file to avoid a NameError.

class Panel(PanelAccessor, ABC):

[bkeryan]

Approved with suggestions