Feat/use rich printer for init

[elizabethengelman]

What

Refactor contract init command to usesoroban-cli/src/print.rs.

Closes #1553

Why

To be more consistent without our output, and to reduce duplication.

Known limitations

n/a

[willemneal]

I have some nits, but in general I think that we should have a the root command handle the print.errorln of the errors. The map_err's with print.errorln here are providing context to the error and should be an error case so that the caller would have that context.

[elizabethengelman]

I have some nits, but in general I think that we should have a the root command handle the print.errorln of the errors. The map_err's with print.errorln here are providing context to the error and should be an error case so that the caller would have that context.

@willemneal that's a good point - instead of printing the error messages and then swallowing the errors, we should return the error for those cases. I can work on that change in a separate PR.