feat: output json stream result and refactor runtime FFI code

[Peefy]

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

• N
• Y

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 8014515852

Details

• 17 of 47 (36.17%) changed or added relevant lines in 5 files are covered.
• 15 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.07%) to 71.911%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/value/val_decorator.rs	1	2	50.0%
kclvm/runtime/src/context/mod.rs	1	5	20.0%
kclvm/runtime/src/_kcl_run.rs	0	25	0.0%

Files with Coverage Reduction	New Missed Lines	%
kclvm/runner/src/runner.rs	1	96.81%
kclvm/runtime/src/value/val_get_set.rs	1	95.0%
kclvm/runtime/src/context/mod.rs	2	9.57%
kclvm/runtime/src/_kcl_run.rs	3	0.0%
kclvm/runtime/src/value/val_json.rs	8	77.8%

Totals
Change from base Build 7991767707:	0.07%
Covered Lines:	44249
Relevant Lines:	61533

---

💛 - Coveralls

[zong-zhe]

LGTM