Add ConstInspector and ConstValueTransformer for Handling Constant Columns #709

	name: Testing example extensions

	on:
	push:
	branches: ["master", "main"]
	pull_request:
	branches: ["master", "main"]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.11"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -e .[test]
	- name: Install all packages in example/extension
	run: \|
	python -m pip install -e example/extension/dummyexporter[test]
	python -m pip install -e example/extension/dummymetadatainspector[test]
	python -m pip install -e example/extension/dummycache[test]
	python -m pip install -e example/extension/dummydataconnector[test]
	python -m pip install -e example/extension/dummydataprocessor[test]
	python -m pip install -e example/extension/dummymodel[test]
	- name: Test with pytest
	run: \|
	pytest -vv example/extension

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