Token based authentication integration with core extension

[ggivo]

Description:
This PR Provides the required changes to integrate the token based authentication using the core module from redis-authx.

TokenBasedRedisCredentialsProvider is the main component which handles the id provider creation and management as well as glueing the renewal process to lettuce connection management.

An instance of TokenBasedRedisCredentialsProvider should be provided to Letuce connection through respective RedisUri. In addtion ClientOptions.ReauthenticateBehavior.ON_NEW_CREDENTIALS should be configured on the RedisClient

TokenBasedRedisCredentialsProvider lifecycle is not controlled by the RedisClient itself and need to me managed externaly. TokenBasedRedisCredentialsProvider.shutdown() method need to be invoked once no longer needed to stop renewing tokens.

The configuration and creation of TokenBasedRedisCredentialsProvider is achieved through identity provider-specific configuration builders.

MS EntraID identity provider is already provided within redis-authx.

A basic usage would look like;

 TokenAuthConfig tokenAuthConfig = EntraIDTokenAuthConfigBuilder.builder()
        .clientId("YOUR_CLIENT_ID").secret("YOUR_SECRET")
        .authority("YOUR_AUTHORITY").scopes("SCOPES").build();

TokenBasedRedisCredentialsProvider credentials = TokenBasedRedisCredentialsProvider.create(tokenAuthConfig);

RedisURI uri = RedisURI.builder()
    .withHost("REDIS_HOST")
    .withPort("REDIS_PORT")
    .withAuthentication(credentials).build();  // use pre-configured token based credential provider

RedisClient client = RedisClient.create(uri);
client.setOptions(ClientOptions.builder()
         //enable re-authentication on new credentials
        .reauthenticateBehavior(ClientOptions.ReauthenticateBehavior.ON_NEW_CREDENTIALS)  
        .build());

connection = client.connect()  
...
credentials.close()
redisClient.shutdown();

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[atakavci]

i can anticipate what BaseRedisAuthenticationHandler holds but lets see the actual impl before moving further.

[tishun]

LGTM