refactor/internal (#1216)

* refactor: update import paths in gateway handlers

* refactor: remove obsolete devtools Makefile and README

* build: optimize build process for improved efficiency

* refactor: remove obsolete pkl files related to Matrix and Sonr network configurations

* refactor: move embed code to x/dwn/types

internal/chain/transaction/transaction.go

@@ -0,0 +1,45 @@
+package transaction
+
+type (
+	// Msg uses structural types to define the interface for a message.
+	Msg = interface {
+		Reset()
+		String() string
+		ProtoMessage()
+	}
+	Identity = []byte
+)
+
+// GenericMsg defines a generic version of a Msg.
+// The GenericMsg refers to the non pointer version of Msg,
+// and is required to allow its instantiations in generic contexts.
+type GenericMsg[T any] interface {
+	*T
+	Msg
+}
+
+// Codec defines the TX codec, which converts a TX from bytes to its concrete representation.
+type Codec[T Tx] interface {
+	// Decode decodes the tx bytes into a DecodedTx, containing
+	// both concrete and bytes representation of the tx.
+	Decode([]byte) (T, error)
+	// DecodeJSON decodes the tx JSON bytes into a DecodedTx
+	DecodeJSON([]byte) (T, error)
+}
+
+// Tx defines the interface for a transaction.
+// All custom transactions must implement this interface.
+type Tx interface {
+	// Hash returns the unique identifier for the Tx.
+	Hash() [32]byte
+	// GetMessages returns the list of state transitions of the Tx.
+	GetMessages() ([]Msg, error)
+	// GetSenders returns the tx state transition sender.
+	GetSenders() ([]Identity, error) // TODO reduce this to a single identity if accepted
+	// GetGasLimit returns the gas limit of the tx. Must return math.MaxUint64 for infinite gas
+	// txs.
+	GetGasLimit() (uint64, error)
+	// Bytes returns the encoded version of this tx. Note: this is ideally cached
+	// from the first instance of the decoding of the tx.
+	Bytes() []byte
+}