Add `renku clone` command

[rokroskar]

There are some repository initialization steps that a user might miss when they clone a renku project. This typically leads to issues with git-LFS and potentially other problems. We should create a renku clone command that does these operations for the user to ensure a seamless experience.

The steps that should be done automatically:

• git lfs install --local
• renku githooks install
• others?

closes #213