vim: Support counts for H and L motions (#7149)

Release Notes:

- Added support for counts to `H` and `L` motions
([#4941](https://github.com/zed-industries/zed/issues/4941)).

crates/vim/test_data/test_window_bottom.json

@@ -13,3 +13,7 @@
 {"Put":{"state":"ˇ1 2 3\n4 5 6\n7 8 9\n"}}
 {"Key":"shift-l"}
 {"Get":{"state":"1 2 3\n4 5 6\n7 8 9\nˇ","mode":"Normal"}}
+{"Put":{"state":"1 2 3\n4 5 ˇ6\n7 8 9\n"}}
+{"Key":"9"}
+{"Key":"shift-l"}
+{"Get":{"state":"1 2 ˇ3\n4 5 6\n7 8 9\n","mode":"Normal"}}