feat: improved boilerplate and added solution for part-1

...s/day1/part-1/temporalpractice/bakery/MakeCookiesApp.java

.../day1/part-1/temporalpractice/bakery/OrderCookiesApp.java

...part-1/temporalpractice/bakery/kitchen/KitchenWorker.java

...rt-1/temporalpractice/bakery/kitchen/KitchenWorkflow.java

.../temporalpractice/bakery/kitchen/KitchenWorkflowImpl.java

...t-1/temporalpractice/bakery/kitchen/bake/BakeService.java

...temporalpractice/bakery/kitchen/batter/BatterService.java

...s/day1/part-1/temporalpractice/signals/ConsumeSignal.java

...y1/part-1/temporalpractice/signals/InventoryActivity.java

...art-1/temporalpractice/signals/InventoryActivityImpl.java

...y1/part-1/temporalpractice/signals/InventoryWorkflow.java

solutions/day1/part-1/temporalpractice/signals/MSMain.java

...ava/io/takima/temporalpractice/bakery/MakeCookiesApp.java

...va/io/takima/temporalpractice/bakery/OrderCookiesApp.java