Rename functions/provide friendly name

### Which Data Mapper Version are you using ?

v2

### Describe the Bug with repro steps

When building complex mappings with multiple functions—such as Conditional (IF), Comparison (EQUALS, GREATER THAN), String Manipulation (CONCATENATE, SUBSTRING), or Arithmetic (ADD, MULTIPLY)—it becomes difficult to differentiate between them in the editor. Users often apply the same function multiple times, but since they all appear without distinct labels, identifying the right one to edit can be frustrating.

Expected Behavior:

Users should be able to rename functions or assign friendly names to improve clarity.

### Screenshots or Videos

*No response*

### Version

5\.38.0

### Additional context

*No response*