[golang/go] proposal: reflect: `add Value.TypeAssert[T any]`

### ROOT CAUSE The current `reflect.Value.TypeAssert` method returns an `interface{}` and a boolean, requiring an additional type assertion by the caller. This is inconvenient when the target type is known. The issue proposes adding a generic `TypeAssert` method that returns the value as the target type directly, improving usability with generics. ### CODE FIX Add a new method `TypeAssert[T any]() (T, bool)` to the `reflect.Value` struct. This method should be implemented to be semantically equivalent to `v.Interface().(T)`, but with the same underlying checks as the existing `TypeAssert` method. ```go // TypeAssert returns the value as the given type and a boolean indicating success. // It is a generic version of the existing TypeAssert method. func (v Value) TypeAssert[T any]() (T, bool) { val, ok := v.Interface().(T) return val, ok } ``` Note: The existing `TypeAssert` method remains unchanged as it is not replaced by the `go:fix inline` directive.