feat(arrow, datetime, decimal, uuid): add support for go-option

Add support for `go-option` to the `arrow`, `datetime`, `decimal`, and `uuid`
packages. This allows for handling optional values of the `Arrow`, `Datetime`,
`Interval`, `Decimal`, and `UUID` types.

The following changes have been made:
- Added `go:generate` directives to the `Arrow`, `Datetime`, `Interval`,
  `Decimal`, and `UUID` types to generate optional types using
  `github.com/tarantool/go-option/cmd/gentypes`.
- Implemented `MarshalMsgpack` and `UnmarshalMsgpack` methods for the `Arrow`,
  `Datetime`, `Interval`, and `Decimal` types.
- Added `marshalUUID` and `unmarshalUUID` functions for the `UUID` type.
- The generated `_gen.go` files contain the `Optional*` types that wrap the
  original types and provide methods to handle optional values, including
  `EncodeMsgpack` and `DecodeMsgpack` for `msgpack` serialization.
- Refactored the `datetime` and `decimal` decoders to use the new
  `UnmarshalMsgpack` methods.

Author: bigbes

arrow/arrow.go

@@ -7,6 +7,8 @@ import (
 	"github.com/vmihailenco/msgpack/v5"
 )
 
+//go:generate go run github.com/tarantool/go-option/cmd/gentypes -ext-code 8 Arrow
+
 // Arrow MessagePack extension type.
 const arrowExtId = 8
 
@@ -26,6 +28,15 @@ func (a Arrow) Raw() []byte {
 	return a.data
 }
 
+func (a Arrow) MarshalMsgpack() ([]byte, error) {
+	return a.data, nil
+}
+
+func (a *Arrow) UnmarshalMsgpack(data []byte) error {
+	a.data = data
+	return nil
+}
+
 func arrowDecoder(d *msgpack.Decoder, v reflect.Value, extLen int) error {
 	arrow := Arrow{
 		data: make([]byte, extLen),