refactor: refactor parser

[He1pa]

refactor: refactor parser.

1. remove pkg in module
2. Parser traversal import files from dfs to bfs
3. s/parse_file/parse_single_file

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

• N
• Y

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

parser

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 Parser traversal import files from dfs to bfs

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 11382008481

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 572 of 626 (91.37%) changed or added relevant lines in 12 files are covered.
• 108 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.07%) to 70.464%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runner/src/lib.rs	0	1	0.0%
kclvm/parser/src/lib.rs	471	491	95.93%
kclvm/parser/src/file_graph.rs	81	114	71.05%

Files with Coverage Reduction	New Missed Lines	%
kclvm/parser/src/lib.rs	1	96.1%
kclvm/tools/src/LSP/src/request.rs	3	64.97%
kclvm/tools/src/LSP/src/semantic_token.rs	4	90.99%
kclvm/tools/src/LSP/src/dispatcher.rs	7	65.71%
kclvm/sema/src/advanced_resolver/node.rs	17	84.75%
kclvm/tools/src/LSP/src/state.rs	19	81.14%
kclvm/runtime/src/crypto/mod.rs	57	3.31%

Totals
Change from base Build 11329256193:	-0.07%
Covered Lines:	51682
Relevant Lines:	73345

---

💛 - Coveralls

[Peefy]

Good Job! LGTM