Generate Presigned Upload Url

Generate a temporary url to upload files to S3 using presigned posts.
See: https://docs.aws.amazon.com/AmazonS3/latest/userguide/example_s3_Scenario_PresignedUrl_section.html,
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.generate_presigned_post,
https://github.com/awsdocs/aws-doc-sdk-examples/blob/main/python/example_code/s3/s3_basics/presigned_url.py

Args:
post_data: key value pairs to be sent as form fields in the subsequent POST request made to S3.
current_user
db

Returns:
presigned_post_data: An object that stores the presigned url and the post data.

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