feat: add testing APIs

[Peefy]

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

• N
• Y

• feat: add testing APIs

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

• kclvm.go
• pkg/tools/testing/indent.go
• pkg/tools/testing/reporter.go
• pkg/tools/testing/testing.go

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

• pkg/tools/testing/reporter_test.go
• kclvm_test.go

[coveralls]

Pull Request Test Coverage Report for Build 6976697057

• 57 of 124 (45.97%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 63.014%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/tools/testing/reporter.go	33	45	73.33%
pkg/tools/testing/indent.go	0	22	0.0%
pkg/tools/testing/testing.go	21	54	38.89%

Totals
Change from base Build 6976129650:	-0.5%
Covered Lines:	2680
Relevant Lines:	4253

---

💛 - Coveralls

[zong-zhe]

LGTM