refactor(serialization): provide type registration facade in schema package

[shentongmartin]

this PR centralized type registration to the schema package, hiding details such as Gob or eino's internal serialization mechanism.

New APIs:

// RegisterName registers the given type `T` with a specific name for both the generic
// serialization system and the gob serialization system. This is useful for maintaining
// backward compatibility with older data by explicitly mapping a type to a previously
// used name.
// It panics if the registration fails.
func RegisterName[T any](name string) {}

// Register registers the given type `T` with the gob serialization system and the
// generic serialization system. It automatically determines the type name based on
// its reflection data, including the package path for named types. This function
// should be used for new types where a custom name is not required.
// It panics if the registration fails.
func Register[T any]() {}

For each type that may need to be serialized either by graph or adk, call schema.Register or schema.RegisterName in the init() function within the go file that declares that type. e.g.:

type ChatModelAgentInterruptInfo struct {
	Info *compose.InterruptInfo
	Data []byte
}

func init() {
	schema.Register[*ChatModelAgentInterruptInfo]()
}

[github-actions]

📊 Coverage Report:

File coverage threshold (20%) satisfied:	PASS
Package coverage threshold (30%) satisfied:	PASS
Total coverage threshold (83%) satisfied:	PASS
Total test coverage: 83.2% (6235/7497)

[meguminnnnnnnnn]

覆盖率差一点