feat: export NexoCrypto from package index

[gourabsingha1]

Description

This PR addresses issue #1447 by exporting the NexoCrypto class from the main library entry point (src/index.ts).

Previously, NexoCrypto was not exported from the main entry point, forcing developers to import it via deep internal paths like @adyen/api-library/lib/src/security/nexoCrypto. Since the library compiles to CommonJS, this deep path resolution under ESM-based runtimes returned the default wrapper object { default: [class NexoCrypto] } instead of the class constructor itself, causing runtime TypeError: NexoCrypto is not a constructor unless developers manually appended .default.

By exporting it as a named export from the main index file, both ESM and CommonJS developers can cleanly import NexoCrypto directly from the package root:
import { NexoCrypto } from '@adyen/api-library';

Approach

Added export { default as NexoCrypto } from "./security/nexoCrypto"; to src/index.ts.

Testing

• Ran build successfully with npm run build.
• Ran the entire test suite (npm test) and verified that all 532 tests pass.

[gemini-code-assist]

Code Review

This pull request exports the NexoCrypto class from src/index.ts to support local terminal API security. The reviewer suggests also exporting InvalidSecurityKeyException alongside NexoCrypto to facilitate proper error handling and prevent deep imports for library consumers.

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