feat: enhance lsp hover

[He1pa]

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

• N
• Y [Enhancement][Track] KCL VSCode IDE extension and lsp enhancement #524

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

lsp

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

feat: enhance lsp hover. Hover for schema varibale display schema pkg, schema name, doc and attrs

• 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

[coveralls]

Pull Request Test Coverage Report for Build 5734494378

• 83 of 97 (85.57%) changed or added relevant lines in 3 files are covered.
• 26 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-19.2%) to 68.823%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/LSP/src/hover.rs	22	23	95.65%
kclvm/sema/src/resolver/doc.rs	0	2	0.0%
kclvm/tools/src/LSP/src/tests.rs	61	72	84.72%

Files with Coverage Reduction	New Missed Lines	%
compiler_base/session/src/lib.rs	26	58.06%

Totals
Change from base Build 5714578495:	-19.2%
Covered Lines:	31938
Relevant Lines:	46406

---

💛 - Coveralls

[Peefy]

LGTM