Support temporary security credentials

[gspadotto]

Description:
The current implementation relies on the fact that so-called "long-term" credentials are provided.
There are use cases in which the access to the SQS queue (and, generally speaking, AWS services) is temporarily granted through the "Assume Role" functionality, see:
Delegating API Access to AWS Services Using IAM Roles

Beside the existing input parameters, the following ones should be added:

1. Boolean useDelegation (default: false): in order to distinguish which kind of credentials to use (long or short-term)
2. String roleArn (mandatory only if "useDelegation" is true): the Role ARN
3. String roleSessionName (mandatory only if "useDelegation" is true): the Role Session Name

The high-level flow should be like the following:

EndpointConfiguration endpointConfiguration = new EndpointConfiguration("sqs.<REGION_HERE>.amazonaws.com","<REGION_HERE>");

AmazonSQS sqs = AmazonSQSClientBuilder.standard()
					.withEndpointConfiguration(endpointConfiguration)
				.withCredentials(this.getSTSAssumeRoleSessionCredentialsProvider()).build();
...
private AWSCredentialsProvider getSTSAssumeRoleSessionCredentialsProvider() {	
		return new STSAssumeRoleSessionCredentialsProvider.Builder(
						<ROLE_ARN_HERE>, 
						<ROLE_SESSION_NAME_HERE>
				).withStsClient(getAWSSecurityTokenService()).build();
	}	
...
private AWSSecurityTokenService getAWSSecurityTokenService() {	

		AWSCredentialsProvider credentialsProvider = new AWSStaticCredentialsProvider(envCredentials());

		return AWSSecurityTokenServiceClientBuilder.standard()
				.withRegion(<REGION_HERE>)
				.withCredentials(credentialsProvider)
				.build();
	}
...
private AWSCredentials envCredentials() {
		AWSCredentials creds = new XXXXCredentialsProvider().getCredentials();
		log.trace(
				String.format(
						"Long Term Credentials:\nAccessKeyId = %s\nSecretKey = %s",
						creds.getAWSAccessKeyId(),
						creds.getAWSSecretKey()
				)
		);
		return creds;
	}

Suggested Labels:
Improvement

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Related Issues:
None