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