Added the ability to inject a custom AmazonS3 client

[PavelShahoiko]

Pull Request type

• Bugfix
• Refactoring (no functional changes, no api changes)
• Other (please describe):

NOTE: Please remember to run ./gradlew spotlessApply to fix any format violations.

Changes in this PR

I've added ability to initialize AmazonS3 Client as a separate Bean.

If someone use a S3 compatible storage (e.g. Pure Storage), they will be able to initialize AmazonS3 in their @configuration like in the example below and this client will be used for initializing S3PayloadStorage

Disable default client:

conductor.external-payload-storage.s3.use_default_client: false

Initialisation my own client:

    @Bean
    public AmazonS3 amazonS3Client(S3StorageProperties s3StorageProperties) {
        AWSCredentials credentials = new BasicAWSCredentials(s3StorageProperties.getAccessKey(), s3StorageProperties.getSecretKey());

        return AmazonS3ClientBuilder
            .standard()
            .withCredentials(new AWSStaticCredentialsProvider(credentials))
            .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration(s3StorageProperties.getEndpoint(), s3StorageProperties.getRegion()))
            .withPathStyleAccessEnabled(s3StorageProperties.getPathStyleEnabled())
            .withClientConfiguration(new ClientConfiguration().withProtocol(Protocol.HTTPS))
            .build();
    }

Discussion: #3693

Alternatives considered

Describe alternative implementation you have considered