Harden Puller logic in the side-car Agent

[ifilonenko]

/kind feature

Describe the solution you'd like
With the merging of #989 a variety of enhancements are still required before we can remove the [POC] label from the multi-model puller. These enhancements include but are not limited to:

• Handle retries
• Move logger to zapr
• Set proper buffer size
• Handle request logic
• Implement a variety of protocols: HDFS, GCS, FILE, HTTPS
• Handle proper config overrides of s3 clients
• Remove need for timestamp for config diffing by using a bool
• Figure out if mid-download failures can be checkpointed and recovered *optional
• loop through map in a parallel way instead of sequential *optional
• Handle load, unload, load events *optional

Anything else you would like to add:

• Unit tests
• End to End tests

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