deps: make cloud-volume optional instead of required

Author: AdityaGupta716

pyproject.toml

@@ -10,7 +10,6 @@ dynamic = ["version"]
 
 dependencies = [
     "brainglobe-atlasapi>=2.0.1",
-    "cloud-volume>=3.11.0",
     "brainglobe-space>=1.0.0",
     "brainglobe-utils>=0.5.0",
     "h5py",