Add :editor word-wrap module

Defines a new minor-mode `+word-wrap-mode` which configures
adaptive-wrap-prefix-mode and visual-line-mode for smart soft-wrapping
of code.

Evil users can toggle it with `SPC t w`.

Enable globally with `+global-word-wrap-mode`.

See the README for more details!

modules/config/default/+evil-bindings.el

@@ -824,6 +824,7 @@
         :desc "Indent guides"                "i" #'highlight-indent-guides-mode
         :desc "Indent style"                 "I" #'doom/toggle-indent-style
         :desc "Line numbers"                 "l" #'doom/toggle-line-numbers
+        :desc "Word-wrap mode"               "w" #'+word-wrap-mode
         :desc "org-tree-slide mode"          "p" #'+org-present/start
         :desc "Flyspell"                     "s" #'flyspell-mode))