Implement chunk_by operation (#14410)

# Description

This pull requests implements a new ~~partition-by~~ `chunk-by` command.
The operation takes a closure and partitions the input list into
sublists based on the return value of the closure.
- fixes #14149

Examples, tests and and documentation were added accordingly.


![image](https://github.com/user-attachments/assets/c272e2ec-9af3-4a88-832b-ddca4eb14c8f)


![image](https://github.com/user-attachments/assets/178968e7-c165-4d8c-858c-98584d653b0a)

crates/nu-command/tests/commands/mod.rs

@@ -8,6 +8,7 @@ mod break_;
 mod bytes;
 mod cal;
 mod cd;
+mod chunk_by;
 mod chunks;
 mod compact;
 mod complete;