Introduce esbuild on webpack (#14578)

* Vendor node mods as cache; fix esbuild/fomantic offline build

* Fix --exclude; use bsdtar for consistent globbing

* Fall back to GNU tar; forward-compatible for APT 2.0

* Avoid having extd. attrs with bsdtar

* Dependency and misc. optimizations

* Remove extra code after esbuild-loader update

Co-authored-by: Mike L <cl.jeremy@qq.com>

.gitignore

@@ -80,6 +80,8 @@ coverage.all
 /public/css
 /public/fonts
 /public/img/webpack
+/web_src/fomantic/node_modules
+/web_src/fomantic/semantic.json
 /web_src/fomantic/build/*
 !/web_src/fomantic/build/semantic.js
 !/web_src/fomantic/build/semantic.css
@@ -93,6 +95,7 @@ coverage.all
 !/web_src/fomantic/build/themes/default/assets/fonts/outline-icons.woff2
 /VERSION
 /.air
+/.npm-cache
 
 # Snapcraft
 snap/.snapcraft/