feat: lsp file watcher.

[He1pa]

1. Actively monitor file system changes. These changes will not be notified through lsp, e.g., execute kcl mod add xxx, kcl fmt xxx
2. fix external pkg complete

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

• N
• Y
  [bug] After updating dependencies through commands, lsp cannot be automatically updated #1623
  [WIP] KCL configuration files watch system design #1564

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):

1. Actively monitor file system changes. These changes will not be notified through lsp, e.g., execute kcl mod add xxx, kcl fmt xxx
2. fix external pkg complete

• 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 11721570179

Details

• 280 of 320 (87.5%) changed or added relevant lines in 6 files are covered.
• 18 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.1%) to 70.706%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/LSP/src/tests.rs	165	168	98.21%
kclvm/tools/src/LSP/src/state.rs	87	124	70.16%

Files with Coverage Reduction	New Missed Lines	%
kclvm/tools/src/LSP/src/request.rs	5	65.78%
kclvm/tools/src/LSP/src/state.rs	6	82.7%
kclvm/driver/src/lib.rs	7	83.49%

Totals
Change from base Build 11701909246:	0.1%
Covered Lines:	52377
Relevant Lines:	74077

---

💛 - Coveralls

[Peefy]

LGTM