Update CI to check docs, analyzers, and run unit tests

[dixonjoel]

What does this Pull Request accomplish?

Adds some workflows including checking the documentation, running analyzers (pyright, mypy etc), and running whatever unit tests it finds. Currently there's only one dummy unit test to ensure they are running.

Why should this Pull Request be merged?

Start of repo CI and unit tests to keep the repo healthy.

What testing has been done?

Unit tests and new workflows are running on this PR.

[Copilot]

Pull Request Overview

This PR establishes CI infrastructure for the repository by adding GitHub Actions workflows and a basic unit test structure. It replaces the inactive CI placeholder with comprehensive automated checks for code quality, documentation, and testing.

Key changes:

• Adds reusable workflows for analyzer checks (pyright, mypy, bandit), documentation generation, and unit test execution
• Creates a basic test structure with a dummy unit test to validate the testing pipeline
• Configures CI to run across multiple Python versions (3.9-3.13) and operating systems (Windows, Ubuntu)

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/CI.yml	Main CI workflow that orchestrates analyzer checks, documentation validation, and unit tests across multiple environments
.github/workflows/check_analyzers.yml	Reusable workflow for running static analysis tools (mypy, pyright, bandit) and linting
.github/workflows/check_docs.yml	Reusable workflow for validating documentation builds using Sphinx
.github/workflows/run_unit_tests.yml	Reusable workflow for executing unit tests with pytest across different Python versions and OS
.github/actions/run_and_upload_unit_tests/action.yml	Composite action that runs pytest with coverage and uploads test results as artifacts
tests/init.py	Root test package initialization
tests/unit/init.py	Unit test package initialization
tests/unit/test_ni_datastore_client.py	Dummy unit test to validate the testing pipeline is functional

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