moving docling to it's own group

Author: avinash2692

pyproject.toml

@@ -39,7 +39,6 @@ dependencies = [
     "typer",
     "click<8.2.0", # Newer versions will cause errors with --help in typer CLIs.
     "mistletoe>=1.4.0",
-    "docling>=2.28.1",
 ]
 
 [project.scripts]
@@ -64,6 +63,9 @@ hf = [
 watsonx = [
     "ibm-watsonx-ai>=1.3.31",
 ]
+docling = [
+    "docling>=2.45.0",
+]
 
 [dependency-groups]
 # Use these like: