feat(js-sdk): Add TurboQuote module

[nicolasiscoding]

Summary

Add a TurboQuote module to the JS SDK with full UI parity for TurboQuote. This includes:

• 68 static methods across 12 entity groups: Quotes, Line Items, Products, Bundles, Price Books, Companies, Contacts, Templates, Types/Categories, Approval Workflows, and a createAndSend convenience method
• 11 type files with full TypeScript types for all request/response shapes
• HttpClient extensions: getRaw() for PDF download, postFormData()/patchFormData() for product image uploads
• 70 unit tests covering all methods with mocked HttpClient
• DX-first design: minimal required fields, single-or-batch line items, direct parameters for simple ops, hidden API inconsistencies (e.g., template endpoint path mismatch)

Follow-up work

• Port to Python SDK
• Port to Go SDK
• Port to PHP SDK
• Port to Java SDK
• Add product image upload integration tests
• Add usage examples (examples/turboquote-*.ts)

Design decisions

See the plan file and PR description for details on architecture choices (single static class, createAndSend convenience, skipSenderValidation, etc.)