feat(auth): add Entra ID identity provider integration

Introduces Entra ID (former Azure AD) authentication support with multiple authentication flows
and automated token lifecycle management.

Key additions:
- Add EntraIdCredentialsProvider for handling Entra ID authentication flows
- Implement MSALIdentityProvider to integrate with MSAL/EntraID authentication library
- Add support for multiple authentication methods:
  - Managed identities (system and user-assigned)
  - Client credentials with certificate
  - Client credentials with secret
  - Authorization Code flow with PKCE
- Add factory class with builder methods for each authentication flow
- Include sample Express server implementation for Authorization Code flow
- Export core auth types from client package for reuse
- Add comprehensive configuration options for authority and token management

Package exports (@redis/client):
- Added package.json "exports" field to enable auth folder barrel exports
- Included additional export paths ("./index" and "./dist/*") to maintain
  compatibility with existing deep imports across the monorepo packages

This change enables Azure-based authentication flows while maintaining consistent
token lifecycle management patterns established in the core authentication system.

packages/client/lib/client/authx/index.ts

@@ -0,0 +1,13 @@
+import { TokenManager, TokenManagerConfig, TokenStreamListener, RetryPolicy, IDPError } from './token-manager';
+export { TokenManager, TokenManagerConfig, TokenStreamListener, RetryPolicy, IDPError };
+import { Disposable } from './types';
+export { Disposable };
+
+import { CredentialsProvider, StreamingCredentialsProvider, UnableToObtainNewCredentialsError, CredentialsError, StreamingCredentialsListener, AsyncCredentialsProvider, ReAuthenticationError, BasicAuth } from './credentials-provider';
+export { CredentialsProvider, StreamingCredentialsProvider, UnableToObtainNewCredentialsError, CredentialsError, StreamingCredentialsListener, AsyncCredentialsProvider, ReAuthenticationError, BasicAuth };
+
+import { Token } from './token';
+export { Token };
+
+import { IdentityProvider, TokenResponse } from './identity-provider';
+export { IdentityProvider, TokenResponse };

packages/client/lib/client/index.ts

@@ -1,6 +1,5 @@
 import COMMANDS from '../commands';
-import { BasicAuth, CredentialsError, CredentialsProvider, StreamingCredentialsProvider, UnableToObtainNewCredentialsError  } from './authx/credentials-provider';
-import {Disposable} from './authx/types';
+import { BasicAuth, CredentialsError, CredentialsProvider, StreamingCredentialsProvider, UnableToObtainNewCredentialsError, Disposable  } from './authx/';
 import RedisSocket, { RedisSocketOptions } from './socket';
 import RedisCommandsQueue, { CommandOptions } from './commands-queue';
 import { EventEmitter } from 'node:events';

packages/client/package.json

@@ -4,6 +4,32 @@
   "license": "MIT",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    },
+    "./index": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    },
+    "./authx": {
+      "types": "./dist/lib/client/authx/index.d.ts",
+      "default": "./dist/lib/client/authx/index.js"
+    },
+    "./lib/commands/generic-transformers": {
+      "types": "./dist/lib/commands/generic-transformers.d.ts",
+      "default": "./dist/lib/commands/generic-transformers.js"
+    },
+    "./dist/*": {
+      "types": "./dist/*.d.ts",
+      "default": "./dist/*.js"
+    },
+    "./lib/errors": {
+      "types": "./dist/lib/errors.d.ts",
+      "default": "./dist/lib/errors.js"
+    }
+  },
   "files": [
     "dist/",
     "!dist/tsconfig.tsbuildinfo"