feat: add initial version of evaluator

[Peefy]

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

• N
• Y

re #291

• feat: add initial version of evaluator

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

• kclvm/compiler/src/codegen/llvm/context.rs
• kclvm/compiler/src/codegen/llvm/node.rs
• kclvm/evaluator/Cargo.toml
• kclvm/evaluator/src/error.rs
• kclvm/evaluator/src/node.rs

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/evaluator/src/tests.rs

[coveralls]

Pull Request Test Coverage Report for Build 8417973412

Details

• 367 of 1545 (23.75%) changed or added relevant lines in 7 files are covered.
• 39 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-1.0%) to 71.243%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/value/api.rs	0	2	0.0%
kclvm/runtime/src/value/val_dict.rs	0	20	0.0%
kclvm/runtime/src/value/val_attr.rs	0	58	0.0%
kclvm/evaluator/src/lib.rs	248	740	33.51%
kclvm/evaluator/src/node.rs	98	704	13.92%

Files with Coverage Reduction	New Missed Lines	%
kclvm/runtime/src/value/api.rs	1	0.0%
kclvm/runtime/src/manifests/mod.rs	38	2.56%

Totals
Change from base Build 8414900581:	-1.0%
Covered Lines:	45527
Relevant Lines:	63904

---

💛 - Coveralls