Enhance job api to return associated feature table and start time

[khorshuheng]

Signed-off-by: Khor Shu Heng [email protected]

What this PR does / why we need it:
As part of an effort to create an UI for Feast, the JobService API needs to return more information, in particular, job start time and the feature table associated with the ingestion jobs.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

gRPC responses for submitting spark jobs via job service now have additional fields: start time for all types of jobs, and feature table for ingestion jobs. These fields have also been added to the corresponding Job object returned by list_jobs and get_job API.

[pyalex]

/test test-end-to-end-aws

[khorshuheng]

/test test-end-to-end-gcp

[feast-ci-bot]

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

Test name	Commit	Details	Rerun command
test-end-to-end-azure	c5b4e98	link	/test test-end-to-end-azure

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[pyalex]

/lgtm