refactor: doc string parse to prevent the regex calling and remove the prec2 deps

[Peefy]

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

• N
• Y

• refactor: doc string parse to prevent the regex calling

• Removed the regex library prec2, as it requires c99 compilation in some old gcc environments (such as centos7)

• Removed one clone deep copy and directly used the strip function to remove the first quotation mark

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

• kclvm/sema/Cargo.toml
• kclvm/sema/src/resolver/doc.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/sema/src/resolver/doc.rs

[zong-zhe]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 8682810265

Details

• 18 of 23 (78.26%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.01%) to 73.342%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/sema/src/resolver/doc.rs	18	23	78.26%

Files with Coverage Reduction	New Missed Lines	%
kclvm/sema/src/core/symbol.rs	3	46.54%

Totals
Change from base Build 8660589058:	0.01%
Covered Lines:	48994
Relevant Lines:	66802

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💛 - Coveralls