vim: Implement partial increment/decrement for visual selection (#36553)

This change adds the ability to increment / decrement numbers that are
part of a visual selection. Previously Zed would resolve to the entire
number under visual selection for increment as oppposed to only
incrementing the part of the number that is selected

Release Notes: 

- vim: Fixed increment/decrement in visual mode

crates/vim/test_data/test_increment_visual_partial_number.json

@@ -0,0 +1,20 @@
+{"Put":{"state":"ˇ123"}}
+{"Key":"v"}
+{"Key":"l"}
+{"Key":"ctrl-a"}
+{"Get":{"state":"ˇ133","mode":"Normal"}}
+{"Key":"l"}
+{"Key":"v"}
+{"Key":"l"}
+{"Key":"ctrl-a"}
+{"Get":{"state":"1ˇ34","mode":"Normal"}}
+{"Key":"shift-v"}
+{"Key":"y"}
+{"Key":"p"}
+{"Key":"p"}
+{"Key":"ctrl-v"}
+{"Key":"k"}
+{"Key":"k"}
+{"Key":"l"}
+{"Key":"ctrl-a"}
+{"Get":{"state":"ˇ144\n144\n144","mode":"Normal"}}