feat: add code runner for configuration code execution

[adohe]

What type of PR is this?

/kind feature

What this PR does / why we need it:

add code runner to execute configuration code

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 7968250190

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• -6 of 28 (78.57%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 76.947%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cmd/generate/run/run.go	22	28	78.57%

Totals
Change from base Build 7795660400:	0.09%
Covered Lines:	8785
Relevant Lines:	11417

---

💛 - Coveralls

[liu-hm19]

lgtm