Fix goto attr def from attr def itself, add test cases on goto-def and find-refs

[amyXia1994]

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

• N
• Y

close #754
It turns out the the find refs failed from the schema attribute def, is caused because the goto-def ignored the case when goto-def from schema attr def. Thanks to @He1pa we fixed the bug and added more tests on it.

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

• the fix:
  • kclvm/tools/src/LSP/src/util.rs
• the tests:
  • kclvm/tools/src/LSP/src/find_refs.rs
  • kclvm/tools/src/LSP/src/goto_def.rs

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

Fix goto attr def from attr def itself, add test cases on goto-def and find-refs

• 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 6506951355

• 61 of 62 (98.39%) changed or added relevant lines in 3 files are covered.
• 26 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-16.8%) to 71.265%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/LSP/src/find_refs.rs	44	45	97.78%

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

Totals
Change from base Build 6505829489:	-16.8%
Covered Lines:	36308
Relevant Lines:	50948

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💛 - Coveralls