[Enhancement]: GetAccessToken for Java

[luetobeaws]

Background story

We would like to use the GetAccess Token using Client Credentials from Lambda to authenticate with Amazon Cognito

What does this example accomplish?

The example will describe how to obtain a token from Cognito using Client Credentials.

Which AWS service(s)?

cognito

Which AWS SDKs or tools?

• [ ] All languages
• [ ] .NET
• [ ] C++
• [ ] Go (v2)
• [ ] Java
• [X] Java (v2)
• [ ] JavaScript
• [ ] JavaScript (v3)
• [ ] Kotlin
• [ ] PHP
• [ ] Python
• [ ] Ruby
• [ ] Rust
• [ ] Swift
• [ ] Not applicable

Are there existing code examples to leverage?

https://stackoverflow.com/questions/56954135/getting-amazon-cognito-access-token-in-java

Do you have any reference code?

final String clientId = "XXXXXXXXXXXXXXXXXXXXXXXXX";
final String region = "eu-west-1";
final String username = "USERNAME";
final String password = "PASSWORD";
AWSCognitoIdentityProvider cognitoClient = AWSCognitoIdentityProviderClientBuilder.standard()
            .withRegion(region)
            .build();
final Map<String, String> authParams = new HashMap<>();
authParams.put("USERNAME", username);
authParams.put("PASSWORD", password);
final InitiateAuthRequest authRequest = new InitiateAuthRequest();
authRequest.withAuthFlow(AuthFlowType.USER_SRP_AUTH)
            .withClientId(clientId)
            .withAuthParameters(authParams);
InitiateAuthResult result = cognitoClient.initiateAuth(authRequest);

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