Add load test GitHub Action

[woop]

What this PR does / why we need it:

Adds a GitHub Action that runs a load tests as part of all PRs and direct pushes. This test runs a range of tests with the following parameters

• Entity count 10 and 50
• RPS 20, 50, 250
• 1 feature set
• 13 features, one of each type

Does this PR introduce a user-facing change?:

NONE

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: woop

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[woop]

/test publish-docker-images

[feast-ci-bot]

@woop: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
test-end-to-end-batch-dataflow	5d04f43	link	/test test-end-to-end-batch-dataflow

Full PR test history

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