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>

src/bin/bat/app.rs

@@ -405,6 +405,7 @@ impl App {
                 } else {
                     match self.matches.get_one::<String>("wrap").map(|s| s.as_str()) {
                         Some("character") => WrappingMode::Character,
+                        Some("word") => WrappingMode::Word,
                         Some("never") => WrappingMode::NoWrapping(true),
                         Some("auto") | None => {
                             if self.interactive_output || maybe_term_width.is_some() {