dev-embedded/arduino-ide: add 2.3.7, definitely different from arduino

- This is definitely a new package, different from package in ::gentoo
  `dev-embedded/arduino::gentoo`
- Arduino IDE 2.x is a completely new application based on
  Eclipse Theia, and can coexist with the classic Arduino IDE 1.x.

Signed-off-by: Huang Rui <vowstar@gmail.com>

dev-embedded/arduino-ide/files/arduino-ide.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Name=Arduino IDE
+Comment=Arduino IDE 2.x - Open-source electronics prototyping platform
+GenericName=Arduino IDE
+Exec=/usr/bin/arduino-ide @exec_extra_flags@ %U
+Icon=arduino-ide
+Type=Application
+StartupNotify=true
+StartupWMClass=Arduino IDE
+Categories=Development;IDE;Electronics;
+MimeType=text/x-arduino;
+Keywords=arduino;electronics;microcontroller;embedded;