feat: create libretime_shared package (#1349)

* feat: create libretime_shared package

- We don't use pydantic.BaseSettings because of some
  incompatble loading behavior.

* fix: whitelist pydantic in pylintrc

* docs: update to new BaseConfig behavior

* docs: change confusing config filepath

shared/setup.py

@@ -0,0 +1,29 @@
+from os import chdir
+from pathlib import Path
+
+from setuptools import setup
+
+here = Path(__file__).parent
+chdir(here)
+
+setup(
+    name="libretime-shared",
+    version="1.0.0",
+    description="LibreTime Shared",
+    url="http://github.com/libretime/libretime",
+    author="LibreTime Contributors",
+    license="AGPLv3",
+    packages=["libretime_shared"],
+    package_data={"": ["py.typed"]},
+    install_requires=[
+        "click",
+        "loguru",
+        "pydantic",
+        "pyyaml",
+    ],
+    extras_require={
+        "dev": [
+            "types-pyyaml",
+        ],
+    },
+)