fix: use triple quote for raw or escaped string

[jakezhu9]

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

• N
• Y

fix: kcl-lang/kcl#947

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

pkg/tools/gen

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

use r"""xxxxxx""" for raw or escaped string and add real world test cases for it (github workflow, k8s, goreleaser)

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

[coveralls]

Pull Request Test Coverage Report for Build 7140035590

• 34 of 34 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 63.875%

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Totals
Change from base Build 7124985066:	0.3%
Covered Lines:	2769
Relevant Lines:	4335

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💛 - Coveralls

[jakezhu9]

Not quite sure why it will fail in CI. On my computer (windows 10), all test pass. I will investigate further later

[amyXia1994]

lgtm

[Peefy]

Good Job! LGTM