feat: enhance doc parse and add lambda doc hover

[Peefy]

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

• N
• Y

Closes #1339

• feat: enhance doc parse and add lambda doc hover

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

• kclvm/compiler/src/codegen/llvm/node.rs
• kclvm/evaluator/src/node.rs
• kclvm/parser/src/parser/module.rs
• kclvm/parser/src/parser/stmt.rs
• kclvm/parser/src/session/mod.rs
• kclvm/sema/src/resolver/doc.rs
• kclvm/sema/src/resolver/doc.rs
• kclvm/sema/src/resolver/global.rs
• kclvm/sema/src/resolver/node.rs
• kclvm/tools/src/LSP/src/completion.rs

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

• 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

• kclvm/tools/src/LSP/src/hover.rs
• test/grammar/scalar/string/string_0/main.k

[He1pa]

LGTM

[zong-zhe]

LGTM