feat: find right value def from schema mixin and protocol

[He1pa]

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

• [ ] N
• [x] Y fix #1619

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):

• [x] N
• [ ] Y

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

• [x] 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 10769633782

Details

• 56 of 57 (98.25%) changed or added relevant lines in 2 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 70.721%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/sema/src/core/scope.rs	43	44	97.73%
<!--	Total:	56	57	98.25%	-->

Files with Coverage Reduction	New Missed Lines	%
kclvm/sema/src/core/scope.rs	2	68.98%
kclvm/sema/src/core/symbol.rs	2	53.36%
<!--	Total:	4		-->

Totals
Change from base Build 10769233756:	-0.03%
Covered Lines:	51249
Relevant Lines:	72466

---

💛 - Coveralls