[feature request] Support yurtadm config command

[YTGhost]

What would you like to be added:
Support the yurtadm config command to provide the user with the default JoinConfiguration.

Why is this needed:
As discussed in #1448, we need to give yurtadm join a --config option. this requires that we can somehow give the user a default config template, so this requirement wants to give the user a default config template using the new yurtadm config command.

The implementation of yurtadm config can be refer to kubeadm config.

others
/kind feature

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[rambohe-ch]

@YTGhost Do you have any progress about this issue?

[YTGhost]

@YTGhost Do you have any progress about this issue?

Sorry for the late reply, I plan to finish it this weekend.

[rambohe-ch]

@YTGhost Do you have any progress about this issue?

Sorry for the late reply, I plan to finish it this weekend.

@YTGhost It's a good job, maybe we can include it in release v1.4.