Add S3 Object resource

[zbbkeepgoing]

Signed-off-by: Binbin Zou [email protected]

Description of your changes

This PR adds an Object resource for S3 bucket that allows create object or directory in a bucket using Crossplane.

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

Manually and through unit tests