feat: add feature gate to controll new features

[zong-zhe]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

re #465

2. What is the scope of this PR (e.g. component or file name):

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 10830540267

Details

• 25 of 66 (37.88%) changed or added relevant lines in 2 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 41.921%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/client/client.go	13	33	39.39%
pkg/features/features.go	12	33	36.36%

Files with Coverage Reduction	New Missed Lines	%
pkg/client/client.go	1	59.41%
pkg/client/visitor.go	2	51.35%

Totals
Change from base Build 10777671329:	-0.1%
Covered Lines:	3448
Relevant Lines:	8225

---

💛 - Coveralls

[Peefy]

LGTM