feat(TER-347): Add unified data source bindings for TypeScript

[ericpsimon]

Summary

• ✨ Added unified data source bindings for TypeScript with support for files, cloud storage, and in-memory data
• 🔄 Migrated Node.js bindings from JavaScript to TypeScript for better type safety
• 📦 Restructured package to use TypeScript compilation with proper npm packaging

Key Features

Data Source Support

• File Sources: CSV, Parquet, JSON support with schema inference
• Cloud Storage: S3 integration with configurable credentials
• In-Memory: Direct DataFrame creation from JavaScript arrays
• DataFusion: Raw SQL queries against registered tables

TypeScript Migration

• Converted all .js files to .ts with full type definitions
• Added tsconfig.json with strict type checking
• Updated build process to compile TypeScript before NAPI build
• Configured proper npm packaging to exclude source files

Changes

• 🏗️ Restructured Node.js bindings from term-guard-node/ to node/term-guard/
• 📝 Added comprehensive TypeScript type definitions
• 🔧 Updated package.json to use TypeScript toolchain
• 📦 Added .npmignore for clean npm packages
• ✅ Migrated all tests to TypeScript

Test Plan

• CI builds pass with new directory structure
• TypeScript compilation succeeds
• All data source types tested (CSV, Parquet, JSON, S3, Memory)
• Node.js bindings compile correctly
• Tests run successfully with tsx

Example Usage

import { ValidationSuite, DataSource } from 'term-guard';

// CSV file
const csvSource = DataSource.fromCsv('/path/to/file.csv', {
  hasHeader: true,
  delimiter: ',',
  schema: { /* optional schema */ }
});

// S3 Parquet file
const s3Source = DataSource.fromS3Parquet('s3://bucket/file.parquet', {
  region: 'us-west-2',
  accessKeyId: 'key',
  secretAccessKey: 'secret'
});

// In-memory data
const memorySource = DataSource.fromMemory([
  { id: 1, name: 'Alice', age: 30 },
  { id: 2, name: 'Bob', age: 25 }
]);

// Run validation
const suite = new ValidationSuite('orders', csvSource);
const result = await suite.run();

🤖 Generated with Claude Code