feat: add app.commandLine.hasSwitch() / app.commandLine.getSwitchValue() (#16282)

* feat: add app.commandLine.hasSwitch() / app.commandLine.getSwitchValue()

* add more tests

* refactor: move appendSwitch / appendArgument to command_line module

* replace AppendSwitchASCII with AppendSwitchNative

* remove castArgs

spec/fixtures/api/command-line/main.js

@@ -0,0 +1,15 @@
+const { app } = require('electron')
+
+app.on('ready', () => {
+  const payload = {
+    hasSwitch: app.commandLine.hasSwitch('foobar'),
+    getSwitchValue: app.commandLine.getSwitchValue('foobar')
+  }
+
+  process.stdout.write(JSON.stringify(payload))
+  process.stdout.end()
+
+  setImmediate(() => {
+    app.quit()
+  })
+})