Update PutObject satellite endpoint to use default retention settings

[jewharton]

Goal

This issue aims to make meaningful progress on Object Lock implementation within core and edge services. Specifically, this will help us support immutable backups in backup software products such as Veeam.

What needs to be done? • Acceptance Criteria

Modify the satellite implementation of the PutObject operation such that if no retention configuration is provided for an object,
a default retention configuration is set based on the bucket's default retention policy (set via the PutObjectLockConfiguration operation).

Depends on…

• Implement Schema Changes for PutObjectLockConfiguration #502

Links

• https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectLockConfiguration.html
• Documentation on S3 Object Lock: Using S3 Object Lock

[halkyon]

Related issue: #512

[storj-gerrit]

Change satellite/metainfo: make BeginObject use default retention settings mentions this issue.