feat: impl schema query API.

[Peefy]

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

• N
• Y

feat: #418

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

• kclvm/capi/src/service/service.rs

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[coveralls]

Pull Request Test Coverage Report for Build 4532267499

• 15 of 175 (8.57%) changed or added relevant lines in 8 files are covered.
• 36 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-25.5%) to 63.802%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/capi/src/api_test.rs	6	8	75.0%
kclvm/capi/src/service/api.rs	3	16	18.75%
kclvm/capi/src/service/service.rs	2	25	8.0%
kclvm/query/src/query.rs	0	48	0.0%
kclvm/capi/src/service/ty.rs	0	74	0.0%

Files with Coverage Reduction	New Missed Lines	%
compiler_base/session/src/lib.rs	36	37.1%

Totals
Change from base Build 4529330673:	-25.5%
Covered Lines:	22670
Relevant Lines:	35532

---

💛 - Coveralls

[zong-zhe]

LGTM