feat: add benchmark and skipping features example

[crandles]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This adds an example of skipping the features package and how to run a benchmark using the testenv client.

Which issue(s) this PR fixes:

Fixes #268

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., Usage docs, etc.:

See included README

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: crandles
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[k8s-ci-robot]

Hi @crandles. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[cpanato]

/ok-to-test

[vladimirvivien]

This is great @crandles .
@cpanato @harshanarayana PTAL