feat: re-work store sdk API to accomodate for Messaging API

[weboko]

Description

Recently we optimized API and execution of LigthPush and Filter but we didn't touch Store

Store is expected to be used in multiple contexts:

• supply messages from Store for web app
• confirm if messages were stored (as per spec)
• retrieve missed messages by hashes
• accommodate for some of the limitations of Store (24h limit, cursor is a message hash)

[weboko]

#2586 is related to this task