feat: generate cmd use terminal ui framework

[adohe]

What type of PR is this?

/kind feature

What this PR does / why we need it:

generate cmd use the terminal ui framework

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 8680384642

Details

• 0 of 14 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 55.472%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cmd/cmd.go	0	2	0.0%
pkg/cmd/generate/generate.go	0	12	0.0%

Totals
Change from base Build 8679807002:	0.07%
Covered Lines:	6828
Relevant Lines:	12309

---

💛 - Coveralls

[elliotxx]

lgtm