Make nodes priority (for redis cluster) configurable in Serving

[pyalex]

Signed-off-by: Oleksii Moskalenko moskalenko.alexey@gmail.com

What this PR does / why we need it:

Prior to this PR Feast Serving only read from master nodes in redis cluster. Here I make it configurable via application.yaml.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

new configuration option

RedisClusterConfig:
   read_from: MASTER | MASTER_PREFERRED | REPLICA | REPLICA_PREFERRED

[feast-ci-bot]

@pyalex: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
test-end-to-end-azure	29c3c33	link	/test test-end-to-end-azure

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[pyalex]

/test test-end-to-end-aws

[khorshuheng]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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