feat: Add the prefix schema to the name of the document symbol

[He1pa]

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

• N
• Y fix [BUG]LSP document symbol error #1560

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

kclvm/tools/src/LSP/src/document_symbol.rs

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

Add the prefix schema to the name of the document symbol. Avoid new a document symbol with empty string ""

https://github.com/microsoft/vscode/blob/922413f6d97e16c05b565398f33d95c306b1ceb7/src/vs/workbench/api/common/extHostTypes.ts#L1384

• 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

[Peefy]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 10366392255

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.002%) to 70.529%

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Files with Coverage Reduction	New Missed Lines	%
kclvm/tools/src/LSP/src/inlay_hints.rs	3	92.31%

Totals
Change from base Build 10349377096:	0.002%
Covered Lines:	50432
Relevant Lines:	71505

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💛 - Coveralls