feat: impl 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

re #178

feat: impl test tool APIs

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

• kclvm/api/src/service/capi.rs
• kclvm/api/src/service/service_impl.rs
• kclvm/spec/gpyrpc/gpyrpc.proto

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

• Unit test: kclvm/api/src/service/service_impl.rs
• e2e test: kclvm/api/src/capi_test.rs

[coveralls]

Pull Request Test Coverage Report for Build 6954382288

• 45 of 48 (93.75%) changed or added relevant lines in 4 files are covered.
• 471 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-15.7%) to 72.165%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/api/src/service/service_impl.rs	26	29	89.66%

Files with Coverage Reduction	New Missed Lines	%
compiler_base/error/src/diagnostic/components.rs	6	0.0%
compiler_base/error/src/errors.rs	8	0.0%
compiler_base/session/src/lib.rs	26	58.06%
compiler_base/error/src/diagnostic/mod.rs	27	0.0%
compiler_base/error/src/diagnostic/style.rs	41	0.0%
compiler_base/error/src/diagnostic/diagnostic_message.rs	74	0.0%
compiler_base/error/src/emitter.rs	119	0.0%
compiler_base/error/src/diagnostic/diagnostic_handler.rs	170	0.0%

Totals
Change from base Build 6953489903:	-15.7%
Covered Lines:	41918
Relevant Lines:	58086

---

💛 - Coveralls

[zong-zhe]

LGTM