feat: support config entry mutual reference.

[Peefy]

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

• N
• Y

re #368. With the mutual-reference feature of attributes in the KCL config entry, we can write fewer KCL codes to eliminate more templates in the configuration and improve the convenience of configuration writing.

• Before

data = {
    name = "nginx"
    metadata.name = "nginx"
}

• After

data = {
    name = "nginx"
    metadata.name = name  # Can reference `name` directly.
}

TODO: Reverse variable reference in configuration block such as the following code:

data = {
    metadata.name = name  # Can reference `name` directly.
    name = "nginx"
}

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/grammar/datatype/dict/mutual_ref_{number}/main.k

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 4080646785

• 74 of 87 (85.06%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-27.8%) to 62.777%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/compiler/src/codegen/llvm/node.rs	44	57	77.19%

Totals
Change from base Build 4080571330:	-27.8%
Covered Lines:	22883
Relevant Lines:	36451

---

💛 - Coveralls