vim: Allow count and repeat for "r" and "shift-r" action (#13287)

Fixing the "r" action just involved adapting `normal_replace` to replace
multiple characters.

Fixing the "shift-r" command was less straightforward. The bindings for
`vim::BeforeNormal` in replace mode were being overwritten and several
other steps required for action repetition were not performed. Finally,
the cursor adjustment after re-entering normal mode was duplicated
(`vim::BeforeNormal` was now triggered correctly) so I removed the
special case for replace mode.

Release Notes:

- Fixed vim "r" action to accept a count argument
- Fixed vim "shift-r" action to accept a count argument and allow
repetition

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/vim/test_data/test_r.json

@@ -0,0 +1,24 @@
+{"Put":{"state":"ˇhello\n"}}
+{"Key":"r"}
+{"Key":"-"}
+{"Get":{"state":"ˇ-ello\n","mode":"Normal"}}
+{"Put":{"state":"ˇhello\n"}}
+{"Key":"3"}
+{"Key":"r"}
+{"Key":"-"}
+{"Get":{"state":"--ˇ-lo\n","mode":"Normal"}}
+{"Put":{"state":"ˇhello\n"}}
+{"Key":"r"}
+{"Key":"-"}
+{"Key":"2"}
+{"Key":"l"}
+{"Key":"."}
+{"Get":{"state":"-eˇ-lo\n","mode":"Normal"}}
+{"Put":{"state":"ˇhello world\n"}}
+{"Key":"2"}
+{"Key":"r"}
+{"Key":"-"}
+{"Key":"f"}
+{"Key":"w"}
+{"Key":"."}
+{"Get":{"state":"--llo -ˇ-rld\n","mode":"Normal"}}

crates/vim/test_data/test_replace_mode_repeat.json

@@ -0,0 +1,10 @@
+{"Put":{"state":"ˇhello world\n"}}
+{"Key":"shift-r"}
+{"Key":"-"}
+{"Key":"-"}
+{"Key":"-"}
+{"Key":"escape"}
+{"Key":"4"}
+{"Key":"l"}
+{"Key":"."}
+{"Get":{"state":"---lo --ˇ-ld\n","mode":"Normal"}}

crates/vim/test_data/test_replace_mode_with_counts.json

@@ -0,0 +1,14 @@
+{"Put":{"state":"ˇhello\n"}}
+{"Key":"3"}
+{"Key":"shift-r"}
+{"Key":"-"}
+{"Key":"escape"}
+{"Get":{"state":"--ˇ-lo\n","mode":"Normal"}}
+{"Put":{"state":"ˇhello\n"}}
+{"Key":"3"}
+{"Key":"shift-r"}
+{"Key":"a"}
+{"Key":"b"}
+{"Key":"c"}
+{"Key":"escape"}
+{"Get":{"state":"abcabcabˇc\n","mode":"Normal"}}