Refactor: remove cargo clippy errors & warnings from runtime

[NeverRaR]

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

• N
• Y
  re [Enhancement] All rust code needs to be fixed by executing cargo clippy --fix --allow-dirty #191

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

/kclvm/runtime

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

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 3334471895

• 114 of 269 (42.38%) changed or added relevant lines in 23 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-29.5%) to 59.975%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/value/val_union.rs	0	1	0.0%
kclvm/runtime/src/context/mod.rs	0	2	0.0%
kclvm/runtime/src/value/val_from.rs	6	8	75.0%
kclvm/runtime/src/value/val_json.rs	1	3	33.33%
kclvm/runtime/src/value/val_clone.rs	3	6	50.0%
kclvm/runtime/src/value/val_list.rs	0	3	0.0%
kclvm/runtime/src/value/val_type.rs	7	10	70.0%
kclvm/runtime/src/value/val_dict.rs	4	8	50.0%
kclvm/runtime/src/stdlib/builtin_api.rs	0	6	0.0%
kclvm/runtime/src/stdlib/builtin.rs	1	9	11.11%

Totals
Change from base Build 3334066564:	-29.5%
Covered Lines:	21772
Relevant Lines:	36302

---

💛 - Coveralls

[Peefy]

LGTM

[chai2010]

LGTM