add redis SSL support to the offline-to-online ingestion job

[oavdeev]

What this PR does / why we need it:
Support SSL option for redis connections (aka "encryption in-transit" in AWS ElastiCache) in the Spark job. SSL is already supported by lettuce/springboot out of the box, so this brings Spark to feature parity.

Does this PR introduce a user-facing change?:

NONE

[feast-ci-bot]

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[oavdeev]

/assign @woop

[oavdeev]

/assign @pyalex

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oavdeev, pyalex

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[pyalex]

/lgtm

[oavdeev]

/kind feature

[woop]

/ok-to-test