feat: add manifests.yaml_stream impl at kclvm runtime.

[Peefy]

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

• N
• Y

feat: #94

• Add the runtime function to implement the customized output of YAML stream format manifests.
• TODO: The corresponding implementation of the KCL UI layer includes function call and runtime impl integration and more UI test suites. @zong-zhe
• TODO: More yaml encode options to impl. @Peefy

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

• unit test suites: kclvm/runtime/src/manifests/yaml.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 3458664862

• 254 of 258 (98.45%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-29.9%) to 59.763%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/value/val_yaml.rs	8	9	88.89%
kclvm/runtime/src/context/mod.rs	0	3	0.0%

Totals
Change from base Build 3438202557:	-29.9%
Covered Lines:	20405
Relevant Lines:	34143

---

💛 - Coveralls

[ldxdl]

More UI test cases are needed with the new sys lib function.

[Peefy]

More UI test cases are needed with the new sys lib function.

Right! The main change of this PR is the implementation of the runtime function. More language UI implementations and test cases need to be completed in another PR by @zong-zhe

[ldxdl]

More options to consider and support:

• Separator: which separator to use between YAML documents (defaults to '---')
• Indent: which kind of indentation to use when emitting (defaults to 2)
• Width: The character width to use when folding text (defaults to 80)
• UseFold: Force folding of text when emitting (defaults to false)
• UseBlock: Force all text to be literal when emitting (defaults to false)
• UseVersion: Display the YAML version when emitting (defaults to false)
• UseHeader: Display the YAML header when emitting (defaults to false)
• Encoding: Unicode format to encode with (defaults to :Utf8)

[Peefy]

More options to consider and support:

• Separator: which separator to use between YAML documents (defaults to '---')
• Indent: which kind of indentation to use when emitting (defaults to 2)
• Width: The character width to use when folding text (defaults to 80)
• UseFold: Force folding of text when emitting (defaults to false)
• UseBlock: Force all text to be literal when emitting (defaults to false)
• UseVersion: Display the YAML version when emitting (defaults to false)
• UseHeader: Display the YAML header when emitting (defaults to false)
• Encoding: Unicode format to encode with (defaults to :Utf8)

This is a good suggestion. I have added some of the options, and some of them left todo because serde_yaml library does not support these capabilities, such as the indent option (Ref: dtolnay/serde-yaml#337)

[ldxdl]

lgtm

[chai2010]

LGTM