feat: lsp completion for internal pkg from program root

[He1pa]

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

• [ ] N
• [x] Y #1429

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

kclvm/tools/src/LSP/src/completion.rs

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

lsp completion for internal pkg from program root

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [ ] Contains experimental features
• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [x] Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• [x] N
• [ ] Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• [x] Unit test
• [ ] Integration test
• [ ] Benchmark (add benchmark stats below)
• [x] Manual test (add detailed scripts or steps below)
• [ ] Other

[coveralls]

Pull Request Test Coverage Report for Build 9679474748

Details

• 55 of 69 (79.71%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 71.44%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/LSP/src/completion.rs	55	69	79.71%
<!--	Total:	55	69	79.71%	-->

Totals
Change from base Build 9678513942:	0.007%
Covered Lines:	55879
Relevant Lines:	78218

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💛 - Coveralls