feat(database/gdb): support to Scan field type value to pointer of basic or slice types

[wanghaolong613]

fix: #3977
Scan 支持将查询的结果直接反序列化至指定变量

[Copilot]

Pull request overview

Adds support for scanning query results directly into pointers to basic types and into slices of basic/pointer element types, addressing gf issue #3977.

Changes:

• Extend Model.Scan to support scanning single-field results into basic types (and scanner-backed types) without struct mapping.
• Improve gconv.Converter.Scan slice handling to populate pointer elements.
• Add MySQL issue test data and a regression test covering pointer/basic/slice scan scenarios.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
util/gconv/internal/converter/converter_scan.go	Enhances slice element scanning to support pointer element allocation/dereference.
util/gconv/internal/converter/converter_bool.go	Adds handling for reflect.Value inputs to Bool conversion.
database/gdb/gdb_model_select.go	Extends Model.Scan to route single-field scans into basic/scanner types.
contrib/drivers/mysql/testdata/issues/3977.sql	Adds schema/data fixture for issue #3977 regression tests.
contrib/drivers/mysql/mysql_z_unit_issue_test.go	Adds regression tests covering Scan into basic/pointer/slice and decimal/scanner types.
contrib/drivers/mysql/go.mod	Adds shopspring/decimal dependency for the new test.
contrib/drivers/mysql/go.sum	Records checksums for the added dependency.

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