Add code editor setting dropdowns (#36534)

Adds three `<select>` controls on top right for indent style, indent
size, and line wrap to the code editor (`_edit`), diff patch editor
(`_diffpatch`) and git hook editor (`/settings/hooks/git/pre-receive`).

The git hooks editor is restyled to wrap the content in a box. Also
included is a bugfix for the git hooks editor where monaco was not
initialized correctly.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

options/locale/locale_en-US.json

@@ -148,6 +148,13 @@
   "filter.private": "Private",
   "no_results_found": "No results found.",
   "internal_error_skipped": "Internal error occurred but is skipped: %s",
+  "characters_spaces": "Spaces",
+  "characters_tabs": "Tabs",
+  "text_indent_style": "Indent style",
+  "text_indent_size": "Indent size",
+  "text_line_wrap": "Wrap",
+  "text_line_nowrap": "No wrap",
+  "text_line_wrap_mode": "Line wrap mode",
   "search.search": "Search…",
   "search.type_tooltip": "Search type",
   "search.fuzzy": "Fuzzy",