refactor: enhance config override at compile time.

[Peefy]

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

• N
• Y

refactor: enhance config override at compile time when the attribute operator is the override operator =.

• kclvm/sema/src/pre_process/config.rs

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

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/sema/src/pre_process/tests.rs

6. Release note

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

None

[coveralls]

Pull Request Test Coverage Report for Build 3127961305

• 26 of 34 (76.47%) changed or added relevant lines in 2 files are covered.
• 222 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.5%) to 57.987%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/sema/src/pre_process/tests.rs	19	27	70.37%

Files with Coverage Reduction	New Missed Lines	%
kclvm/parser/src/lexer/indent.rs	4	78.31%
kclvm/parser/src/lexer/mod.rs	4	80.78%
kclvm/ast/src/token_stream.rs	6	78.57%
kclvm/sema/src/ty/mod.rs	35	66.02%
kclvm/3rdparty/rustc_span/src/analyze_source_file.rs	48	75.26%
kclvm/parser/src/lib.rs	54	83.44%
kclvm/sema/src/resolver/scope.rs	71	60.56%

Totals
Change from base Build 3126390738:	-0.5%
Covered Lines:	20404
Relevant Lines:	35187

---

💛 - Coveralls

[zong-zhe]

LGTM

[He1pa]

lgtm