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.zsh.in

@@ -34,7 +34,7 @@ _{{PROJECT_EXECUTABLE}}_main() {
         '(-d --diff)'--diff'[only show lines that have been added/removed/modified]'
         --diff-context='[specify lines of context around added/removed/modified lines when using `--diff`]:lines'
         --tabs='[set the tab width]:tab width [4]'
-        --wrap='[specify the text-wrapping mode]:mode [auto]:(auto never character)'
+        --wrap='[specify the text-wrapping mode]:mode [auto]:(auto never character word)'
         '!(--wrap)'{-S,--chop-long-lines}
         --terminal-width='[explicitly set the width of the terminal instead of determining it automatically]:width'
         '(-n --number --diff --diff-context)'{-n,--number}'[show line numbers]'