Add Text/Integer Converter operation

[p-leriche]

Description

Converts between text strings and large integers (decimal or hexadecimal), interpreting text as big-endian byte sequences.

Changes

• Add TextIntegerConverter.mjs operation
• Update Categories.json to include Text/Integer Converter in Data format category

Functionality

Bidirectional conversion between text and numeric representations:

• Text → Integer: Interprets each character's code as bytes in big-endian order
• Integer → Text: Decodes integer as big-endian bytes to characters

Examples:

• "ABC" → 4276803 (decimal) or 0x414243 (hex)
• 0x48656C6C6F → "Hello"
• 123456789 → corresponding text representation

Use Cases

• Cryptographic operations requiring numeric text representations
• Encoding/decoding text as numeric values
• Data format conversions
• Understanding byte-level text encoding

Features

• Automatic input format detection:
  • Quoted strings ("text" or 'text')
  • Hexadecimal (0x... prefix)
  • Decimal (plain numbers)
  • Unquoted text (treated as string)
• Output in string, decimal, or hexadecimal format
• Fully pipeable for use in operation chains
• Round-trip validation (string→integer→string preserves original)
• Handles arbitrarily large text using BigInt

Dependencies

Depends on BigIntUtils PR #2205

This operation uses parseBigInt from the shared BigIntUtils library.

Satisfies

Feature Request #2141

This operation uses parseBigInt from the shared BigIntUtils library.

Testing

• Tested text to decimal conversion
• Tested text to hexadecimal conversion
• Tested decimal to text conversion
• Tested hexadecimal to text conversion
• Verified round-trip conversions (string→int→string)
• Tested with quoted and unquoted input
• Built successfully with npm run build