Support Java 17 and 21

• Add support for Watermark operation

• Support for Signed URLs
• Use of new sync API endpoints for job/task wait() methods

• Update dependencies
• HTTP errors do no throw a proper CloudConvertClientException (HTTP 4xx) or CloudConvertServerException (HTTP 5xx) (#41, #44)

import/base64 and import/raw support. (Thanks @iti-gupta2)

Allow overriding upload filename when using streams.

cloudConvertClient.importUsing().upload(new UploadImportRequest(), docxInputStream, "test.docx");