chore(sdk-client-v3): make execute method generic (#1149)

- make the generic method on the Client instance object generic
- add release changeset

Author: ajimae

.changeset/whole-kids-shake.md

@@ -0,0 +1,10 @@
+---
+'@commercetools/ts-client': minor
+---
+
+add generic type to `execute` method
+
+```diff
+- execute(request: ClientRequest): Promise<ClientResult>
++ execute<T extends object = any>(request: ClientRequest): Promise<ClientResult<T>>
+```

packages/sdk-client-v3/src/types/types.d.ts

@@ -323,7 +323,7 @@ type TResponse = {
 }
 
 export type Client = {
-  execute(request: ClientRequest): Promise<ClientResult>
+  execute<T extends object = any>(request: ClientRequest): Promise<ClientResult<T>>
   process<T extends object = any>(
     request: ClientRequest,
     fn: ProcessFn<T>,