fix: schema init in same pkg and add more unit test cases.

[Peefy]

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

• N
• Y

fix #86

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

kclvm/sema/src/resolver/ty_alias.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

After the AST resolver checks, the package aliases and type aliases will be substituted. The substitution error will lead to incorrect codegen code generation, resulting in some symbols not being found.

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

unit test cases in kclvm/sema/src/resolver/tests.rs

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[chai2010]

LGTM

[zong-zhe]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 2555838846

• 33 of 44 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.9%) to 39.898%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/sema/src/resolver/ty_alias.rs	17	19	89.47%
kclvm/sema/src/resolver/tests.rs	16	25	64.0%

Totals
Change from base Build 2528852768:	2.9%
Covered Lines:	14550
Relevant Lines:	36468

---

💛 - Coveralls

[zong-zhe]

LGTM