Add process evaporate config

[hectormerla]

Changes:

Added the prop processEvaporateConfig that allows to transform/modify the evaporate config for each upload.

Why?

To be able to upload with different aws configurations (for example different s3Path).

Example

processEvaporateConfig={(config: any, file: any) => {
  const fileType = file.type.split("/")[0];
  switch (fileType) {
    case 'video':
      return { ...config, s3Path: '/videos' };
    case 'image':
      return { ...config, s3Path: '/images' };
    default:
      return config;
  }
}}