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/service.go

@@ -0,0 +1,25 @@
+package transaction
+
+import "context"
+
+// ExecMode defines the execution mode
+type ExecMode uint8
+
+// All possible execution modes.
+// For backwards compatibility and easier casting, the exec mode values must be the same as in cosmos/cosmos-sdk/types package.
+const (
+	ExecModeCheck ExecMode = iota
+	ExecModeReCheck
+	ExecModeSimulate
+	_
+	_
+	_
+	_
+	ExecModeFinalize
+)
+
+// Service creates a transaction service.
+type Service interface {
+	// ExecMode returns the current execution mode.
+	ExecMode(ctx context.Context) ExecMode
+}