support init with specified template

[healthjyk]

What type of PR is this?

feature

What this PR does / why we need it:

support specifying template when kusion init. By using flag --template-name, you can specify the template you want to use, prompt will not exist.

Which issue(s) this PR fixes:

Fixes #265

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

None

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

None

[coveralls]

Pull Request Test Coverage Report for Build 4955885078

• 17 of 34 (50.0%) changed or added relevant lines in 2 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.03%) to 71.87%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cmd/init/options.go	14	31	45.16%

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/operation/watch.go	1	85.93%
pkg/cmd/ls/types.go	5	83.82%

Totals
Change from base Build 4945960841:	0.03%
Covered Lines:	4862
Relevant Lines:	6765

---

💛 - Coveralls

[amyXia1994]

lgtm

[howieyuen]

/lgtm