feat: make installable with pip

pyproject.toml

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+[build-system]
+requires = ["setuptools>=42"]
+build-backend = "setuptools.build_meta"

setup.cfg

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+[metadata]
+name = causality_lab
+version = 0.0.0
+author = Intel Labs
+description = Research code of novel causal discovery algorithms developed at Intel Labs.
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://github.com/IntelLabs/causality-lab
+keywords = AI, ML, causality
+classifiers =
+    'License :: OSI Approved :: MIT License'
+    'Programming Language :: Python'
+    'Programming Language :: Python :: 3'
+    'Programming Language :: Python :: 3.7'
+    'Programming Language :: Python :: 3.8'
+    'Programming Language :: Python :: 3.9'
+    'Programming Language :: Python :: 3.10'
+    'Programming Language :: Python :: Implementation :: CPython'
+    'Programming Language :: Python :: Implementation :: PyPy'
+
+[options]
+packages = find:
+python_requires = >=3.7
+install_requires =
+    numpy
+    scipy
+    matplotlib
+
+[options.packages.find]
+exclude =
+    unit_tests
+    imgs
+    notebooks
+    example_data