Add word wrapping mode (#3597)

* feat: add word wrapping mode for --wrap flag

* Run `cargo fmt` and add CHANGELOG entry

* Add word wrap tests, update manpage and shell completions

- Add integration tests for word wrapping: basic word boundary breaking,
  fallback to character wrapping for long words, line numbers, and
  short lines that fit without wrapping
- Update manpage to document the new 'word' wrapping mode
- Update bash, fish, zsh, and PowerShell completions with 'word' option
- Avoid unnecessary clone of `line_buf` when word wrap is disabled

* make clippy and cargo fmt happy

---------

Co-authored-by: Keith Hall <keith-hall@users.noreply.github.com>

assets/completions/bat.bash.in

@@ -117,7 +117,7 @@ _bat() {
 		return 0
 		;;
 	--wrap)
-		COMPREPLY=($(compgen -W "auto never character" -- "$cur"))
+		COMPREPLY=($(compgen -W "auto never character word" -- "$cur"))
 		return 0
 		;;
 	--binary)