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/branch/branch.go

@@ -0,0 +1,34 @@
+// Package branch contains the core branch service interface.
+package branch
+
+import (
+	"context"
+	"errors"
+)
+
+// ErrGasLimitExceeded is returned when the gas limit is exceeded in a
+// Service.ExecuteWithGasLimit call.
+var ErrGasLimitExceeded = errors.New("branch: gas limit exceeded")
+
+// Service is the branch service interface. It can be used to execute
+// code paths in an isolated execution context that can be reverted.
+// A revert typically means a rollback on events and state changes.
+type Service interface {
+	// Execute executes the given function in an isolated context. If the
+	// `f` function returns an error, the execution is considered failed,
+	// and every change made affecting the execution context is rolled back.
+	// If the function returns nil, the execution is considered successful, and
+	// committed.
+	// The context.Context passed to the `f` function is a child of the context
+	// passed to the Execute function, and is what should be used with other
+	// core services in order to ensure the execution remains isolated.
+	Execute(ctx context.Context, f func(ctx context.Context) error) error
+	// ExecuteWithGasLimit executes the given function `f` in an isolated context,
+	// with the provided gas limit, this is advanced usage and is used to disallow
+	// an execution path to consume an indefinite amount of gas.
+	// If the execution fails or succeeds the gas limit is still applied to the
+	// parent context, the function returns a gasUsed value which is the amount
+	// of gas used by the execution path. If the execution path exceeds the gas
+	// ErrGasLimitExceeded is returned.
+	ExecuteWithGasLimit(ctx context.Context, gasLimit uint64, f func(ctx context.Context) error) (gasUsed uint64, err error)
+}