Implement TEXTSPLIT function

[Jython1415]

Overview

Implement the TEXTSPLIT function for the named-functions library.

Description

Splits text strings by using column and row delimiters to create a 2D array.

Value Proposition

• More advanced than Google Sheets native SPLIT function
• Creates 2D arrays from delimited text (handles both row and column delimiters)
• Essential for parsing complex structured text formats (CSV, TSV, etc.)
• Enables powerful data transformation workflows

Priority

HIGH

Category

Text Manipulation

Implementation Notes

• Support both row delimiter and column delimiter parameters
• Handle cases with inconsistent column counts
• Consider parameter for padding behavior when rows have different lengths
• Should handle empty strings and consecutive delimiters
• More complex than simple SPLIT - needs careful design

Related

Part of Excel function implementation initiative (#51)

[Jython1415]

Implemented in #124