Refactor: refactor find def in LSP

[He1pa]

Privide functions find_def and resolver_var in LSP to find identifier definition scopeobj. Support finding definitions with different names in one identifier

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):

refactor find_def in LSP.

a.b.c

before: Search all scope obj which name is c
after: Recursively lookup definitions on the inner most scope. Find definition of a, jump to a's scope and search b definition， and c.
So now we can lookup definitions of different names on one ident. It can be used for goto def, hover documents, etc.

• 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 5587176592

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.988%

---

Totals
Change from base Build 5584003002:	0.0%
Covered Lines:	2300
Relevant Lines:	2614

---

💛 - Coveralls

[Peefy]

LGTM