fix: long string quote in the AST printer tool

[Peefy]

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

• N
• Y

fix: #293

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

• internal/kclvm_py/tools/printer/printer.py
• kclvm/ast_pretty/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/ast_pretty/src/tests.rs
• test/test_units/test_kclvm/test_tools/test_printer/test_printer.py

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 3462231228

• 5 of 8 (62.5%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-30.2%) to 59.474%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/ast_pretty/src/node.rs	5	8	62.5%

Totals
Change from base Build 3458953081:	-30.2%
Covered Lines:	19262
Relevant Lines:	32387

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💛 - Coveralls

[chai2010]

LGTM

[zong-zhe]

LGTM