Make Shapely installation optional with extras flag [metrics]

Author: gatli

pyproject.toml

@@ -43,7 +43,7 @@ pydantic = "^1.8.2"
 isort = "^5.10.1"
 numpy = "^1.19.5"
 scipy = "^1.5.4"
-Shapely = "^1.8.0"
+Shapely = { version = ">=1.8.0", optional = true }
 
 [tool.poetry.dev-dependencies]
 poetry = "^1.1.5"
@@ -62,6 +62,9 @@ furo = "^2021.10.9"
 sphinx-autoapi = "^1.8.4"
 pytest-xdist = "^2.5.0"
 
+[tool.poetry.extras]
+metrics = ["Shapely"]
+
 
 [tool.pytest.ini_options]
 markers = [