fix(types): restore backward-compatible TransformableInfo for logform…fix(types): restore backward-compatible TransformableInfo for logform 2.7.0+

[samuel-adedigba]

Summary

Fixes #2528

This PR restores backward compatibility for TypeScript consumers after logform@2.7.0 changed TransformableInfo.message from any to unknown.

Changes

• Re-declare TransformableInfo interface with message: any and index signature [key: string]: any
• Re-declare format namespace functions to use the compatible TransformableInfo type
• Add TransformFunction and FormatWrap types for custom format functions

Problem

Starting with Winston v3.17.0, valid TypeScript code like this stopped compiling:

const logger = winston.createLogger({
  format: winston.format.printf(info => {
    return `${info.level}: ${info.message}`; // Error: 'message' is 'unknown'
  })
});

Solution

Winston now re-declares a backward-compatible TransformableInfo that preserves the original any typing, shielding consumers from the upstream breaking change.

Testing

Verified TypeScript compilation with consumer-style usage patterns
All existing tests pass