Feat: added protobuf support to mana package

go.mod

packages/mana/balance.go

packages/mana/balance_test.go

packages/mana/errors.go

packages/mana/input.go

packages/mana/input_test.go

packages/mana/proto/input.pb.go

packages/mana/proto/input.proto

packages/mana/proto/transfer.pb.go

packages/mana/proto/transfer.proto

packages/mana/transfer.go

packages/mana/transfer_test.go

packages/marshal/encoder.go

packages/marshal/uint64.go

packages/marshaling/errors.go

packages/marshaling/marshal.go

packages/marshaling/types.go

packages/marshaling/unmarshal.go