Feat(kclvm-tools): add json/yaml file loader for KCL-Vet.

[zong-zhe]

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

• N
• Y

issue #67.

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

kclvm-tools/util

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

add json/yaml file loader for KCL-Vet in kclvm/tools/util.

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 3127704207

• 171 of 176 (97.16%) changed or added relevant lines in 2 files are covered.
• 168 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-1.4%) to 59.495%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/util/tests.rs	140	145	96.55%

Files with Coverage Reduction	New Missed Lines	%
kclvm/ast/src/token_stream.rs	6	78.57%
kclvm/error/src/error.rs	6	12.5%
kclvm/capi/src/service/service.rs	9	78.67%
kclvm/src/main.rs	19	1.12%
kclvm/error/src/lib.rs	28	43.02%
kclvm/runner/src/lib.rs	45	56.73%
kclvm/runtime/src/context/mod.rs	55	13.4%

Totals
Change from base Build 3112516770:	-1.4%
Covered Lines:	21379
Relevant Lines:	35934

---

💛 - Coveralls

[ldxdl]

LGTM

[Peefy]

LGTM

[Peefy]

Need more test cases about invalid file path and Json/YAML data.

[Peefy]

LGTM

[He1pa]

LGTM