vim: Allow search with operators & visual mode (#10226)

Fixes: #4346

Release Notes:

- vim: Add search motions (`/,?,n,N,*,#`) in visual modes and as targets
for operators like `d`,`c`,`y`
([#4346](https://github.com/zed-industries/zed/issues/4346)).

crates/vim/test_data/test_visual_block_search.json

@@ -0,0 +1,7 @@
+{"Put":{"state":"ˇone two\nthree four\nfive six\n"}}
+{"Key":"ctrl-v"}
+{"Key":"j"}
+{"Key":"/"}
+{"Key":"f"}
+{"Key":"enter"}
+{"Get":{"state":"«one twoˇ»\n«three fˇ»our\nfive six\n","mode":"VisualBlock"}}