[Chore] Utilize Type.h types in CastExpr-tpl.cpp

[ZacBlanco]

Chore Type

Code Refactoring / Cleanup

Task Description

CastExpr-tpl.cpp defines its own set of types in a enum called PrimitiveKind which is already covered by Type.h there is a lot of duplicated code here that could be just rolled into Type.h. We should refactor CastExpr-tpl.cpp to use the Type.h types instead.

Motivation / Benefit

Less duplicated code, easier to add new types.

Related Files (Optional)

bolt/expression/CastExpr-tpl.cpp, bolt/type/Type.h

Implementation Plan (Optional)

No response

Additional Context

No response

[zhangxffff]

The main difference between PrimitiveKind in CastExpr-tpl.cpp and TypeKind in Types.h is that PrimitiveKind distinguishes SHORT_DECIMAL from BIGINT, whereas TypeKind uses BIGINT for both. This makes it inconvenient to use different template specializations for bigint and short decimal.