Add vision extra sub-module (#33)

pyproject.toml

@@ -25,6 +25,9 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
+vision = [
+]
+all = ["eva[vision]"]
 lint = [
     "isort>=5.12.0",
     "black>=23.1.0",

src/eva/vision/__init__.py

@@ -0,0 +1,10 @@
+"""EVA vision API."""
+try:
+    pass
+except ImportError as e:
+    msg = (
+        "EVA vision requirements are not installed.\n\n"
+        "Please pip install as follows:\n"
+        '  python -m pip install "eva[vision]" --upgrade'
+    )
+    raise ImportError(str(e) + "\n\n" + msg) from e