Add recursive variants of cp-cpr and mv-mvr

Why it matters

The new recursive commands allow users to copy and move directories and their contents recursively within the Keeper client, enhancing file management capabilities by simplifying operations on nested structures.

How to use it

Use the cpr command to recursively copy directories and files, and the mvr command to recursively move directories and files within the Keeper client, similar to how cp and mv commands are used for single files.