Add recurse-submodules option

[Tacha-S]

I added the recurse-submodules option to automatically set up submodules when cloning.

• fix Support submodule setup during rv import #24

I tested this behavior using the following .repos file.

repositories:
  xarm_ros2:
    type: git
    url: https://github.com/xArm-Developer/xarm_ros2.git
    version: jazzy

rv import -i test.repos /tmp/example -r -s

with shallow option
rv import -i test.repos /tmp/example -r -s -l

[ErickKramer]

Thanks for the contribution, would you mind rebasing your branch onto main to address the merge conflicts?

[Tacha-S]

I’ve rebased the branch onto main.

[ErickKramer]

Thanks for that. I checked the changes, and since you are modifying the GitClone function, it would makes sense to have a test where the submodule update functionality is validated. Could you take care of that?

[Tacha-S]

I added some test cases.
Please let me know if there’s anything missing.

[ErickKramer]

Thanks for addressing the tests. I checked and it worked out fine 😄