test: add exec benchmark and unit test suites.

[Peefy]

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

• N
• Y

tests #107. Add more unit test cases and benchmark on the e2e exec function

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

• Test cases are at kclvm/runner/src/exec_data/*.k
• Unit test: kclvm/runner/src/tests.rs
• Benchmark: kclvm/runner/benches/bench_runner.rs

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 2662701743

• 41 of 41 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+6.3%) to 58.524%

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Totals
Change from base Build 2649077295:	6.3%
Covered Lines:	21081
Relevant Lines:	36021

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💛 - Coveralls

[zong-zhe]

LGTM

[He1pa]

LGTM