fixed time.h import, added Arduino UNO R4 minima (USB), Arduino UNO R4 WiFi (USB and WiFi), Arduino Giga R1 (USB and WiFi) (backport #1712)

Cherry-pick of e347a4a821ccbfaa452f595a4304afd6864aedb7 has failed:

On branch mergify/bp/rolling/pr-1712
Your branch is up to date with 'origin/rolling'.

You are currently cherry-picking commit e347a4a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
    modified:   library.properties
    modified:   src/default_transport.cpp

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
    both modified:   .github/workflows/ci.yml
    both modified:   README.md
    both modified:   examples/micro-ros_publisher_wifi/micro-ros_publisher_wifi.ino
    deleted by us:   examples/micro-ros_publisher_wifi_at/micro-ros_publisher_wifi_at.ino
    both modified:   src/micro_ros_arduino.h
    both modified:   src/wifi_transport.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

micro-ROS / micro_ros_arduino

fixed time.h import, added Arduino UNO R4 minima (USB), Arduino UNO R4 WiFi (USB and WiFi), Arduino Giga R1 (USB and WiFi) (backport #1712) #1863