feat(core): add branch service (#18379)

Co-authored-by: unknown unknown <unknown@unknown>

core/CHANGELOG.md

@@ -36,6 +36,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+* [#18379](https://github.com/cosmos/cosmos-sdk/pull/18379) Add branch service.
+
 ## [v0.12.0](https://github.com/cosmos/cosmos-sdk/releases/tag/core%2Fv0.11.0)
 
 :::note

core/branch/branch.go

@@ -0,0 +1,19 @@
+// Package branch contains the core branch service interface.
+package branch
+
+import "context"
+
+// 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
+}