vim: Add (half of) ctrl-v/ctrl-q (#19585)

Release Notes:

- vim: Add `ctrl-v`/`ctrl-q` to type any unicode code point. For example
`ctrl-v escape` inserts an escape character(U+001B), or `ctrl-v u 1 0 E
2` types ტ (U+10E2). As in vim `ctrl-v ctrl-j` inserts U+0000 not
U+000A. Zed does not yet implement insertion of the vim-specific
representation of the typed keystroke for other keystrokes.
- vim: Add `ctrl-shift-v` as an alias for paste on Linux

crates/vim/test_data/test_ctrl_v.json

@@ -0,0 +1,24 @@
+{"Put":{"state":"ˇ"}}
+{"Key":"i"}
+{"Key":"ctrl-v"}
+{"Key":"0"}
+{"Key":"0"}
+{"Key":"0"}
+{"Get":{"state":"\u0000ˇ","mode":"Insert"}}
+{"Key":"ctrl-v"}
+{"Key":"j"}
+{"Get":{"state":"\u0000jˇ","mode":"Insert"}}
+{"Key":"ctrl-v"}
+{"Key":"x"}
+{"Key":"6"}
+{"Key":"5"}
+{"Get":{"state":"\u0000jeˇ","mode":"Insert"}}
+{"Key":"ctrl-v"}
+{"Key":"U"}
+{"Key":"1"}
+{"Key":"F"}
+{"Key":"6"}
+{"Key":"4"}
+{"Key":"0"}
+{"Key":"space"}
+{"Get":{"state":"\u0000je🙀 ˇ","mode":"Insert"}}